Any Function Matlab

This means that the function for evaluating, say, f(x), must be coded so that when called with a row vector x, it returns a row vector fx of corresponding function values. The mexFunctions are not intended to be a substitue for MATLAB's Built-In operations however if you need to code many loops and other things that MATLAB is not very good at, this is a good option. And it's not mat lab it's MATLAB MATLAB is a software made by company mathworks. Any command or function whose first line of help text contains the given keyword will be returned by the "lookfor" command. These functions execute MATLAB commands in Microsoft Excel. See the "Example" section for more. the MATLAB Desktop Tools and Development Environment documentation. MATLAB functions are similar to C functions or Fortran subroutines. Either way, your comments claim they are constants so define them once, outside the loop, in that case, although Z clearly isn't a constant. m functions are more flexible and more easily extensible. remember that any numerical integration, if it is to be accurate, must put many points in any region of importance. Derivative in Matlab. Evaluating Functions and Retrieving Variable Values. Matlab may be acquired for any computer through the MSU Computer store, or can be installed on Engineering owned machines by DECS. MATLAB uses default values for any properties that you do not explicitly define as arguments. The main function should. You typically don't have source code for built-in functions and must treat them simply as black boxes. MATLAB Function Example Handout. The cellstr function converts a character array into a cell array of strings. Using root-finding calculate \(\sqrt{R}\). We may also want to pass user input to the QGis functions. An anonymous function is a simple, typical a single line, user-de ned function that is de ned and written within the computer code (not in a separate le) and is then used in the code. Then, Spreadsheet Link specifies this command for evaluation in the MATLAB workspace. Matlab, an abbreviation of Matrix Laboratory, is a commercial programming language that offers a range of built in functions and tools. MathTutorDVD. I tried in MATLAB also using FFT & PWELCH function. One nice quality of LDA is that, unlike some of the alternatives, it does not require multiple passes over the data for optimization. We will explore some of the more common ones below. Then for any value x on this interval. If you cannot see one of the windows, click on VIEW in the toolbar, and you will see a list of windows. These solvers can be used with the following syntax: [outputs] = function_handle(inputs) [t,state] = solver(@dstate,tspan,ICs,options) Matlab algorithm (e. If you get a message saying that Matlab cannot find your m-file, on the command line type. While nested functions have access to the parent function's scope in Matlab, no such thing is available in Octave, due to how Octave essentially “un-nests” nested functions. Avoid overloading built-ins — Avoid overloading built-in functions on any standard MATLAB data classes. Because they are variables, function handles can be used to access many different functions, and can even "point to" different functions as the program runs. should not have the same name as any matlab functions. Multiple Core Jobs. After entering MATLAB as described in section 1, the command help will display a list of functions for which on-line help is available; the command help functionname will give information about a specific function. Or, you can write a series of commands to a file that you then execute as you would any MATLAB function. The function requires two inputs for the endpoints of the output vector, and it also accepts a third, optional input to specify the number of points to include between the endpoints. Without this, it will not be easy to solve the problems in MATLAB. In birthday6. Call MATLAB Functions from Python Return Output Argument from MATLAB Function. Function 'factorial' In Matlab, we can use built-in function 'factorial', like this: n = 9 % use function factorial. py, the function calls in lines 9 and 10 were outside any function definition, so they did actually lead to immediate execution of the function. The function is a local function within a script file. Any block of code appearing in more than one m-file should be considered for packaging as a function. function (data), rather than a formula for the function. The output, such as variables and result files, from the simulation can also be configured by the user. let's say i build a model at Simulink then i want to get the Transfer Function of that model. MatLab is a program developed by MathWorks Incorporated. To use a function, type the name of the function in the command window followed by a parentheses. Use this syntax in the body of a function only. m file also backs up any changes it makes to MATLAB configuration files. Write a Matlab script to use QGis functions After setting up the QGis environment, we can now call the QGis functions from within Matlab. Matlab is a software package that makes it easier for you to enter matrices and vectors, and manipulate them. MATLAB will execute the above statement and return the following result − ans = 0. m files or "symbolic" functions. An inline function is. For more information, see Run MATLAB Functions on a GPU. Now, any QGis functions can be called using Matlab's symbol for calling system functions ('!'). This program provides a high-level language and interactive environment that enables you to perform computationally intensive tasks faster than with traditional programming languages such as C, C++, and Fortran. If you find any sort of problem, you can ask in comments anytime without even feeling any kind of hesitation. Type - Type of function. In most cases, access is actually provided by external binaries, but this is hidden within audioread (and its subfunctions). We provide a number of MATLAB functions that may prove of value to the Macro-Investment Analyst and, possibly, others. This method removes trailing spaces in the inputs. matlab-help-text asec CSC acsc cot acot exp log logic sqrt abs angle conj imag real fix floor ceil round mod rem sign norm rank det expm logm sqrtm max min mean median std sort sortrows sum prod hist diff gradient fft plot ioglog - semilogx - semilogy - polar plotyy Inverse Secant. The only difference between this function and the previous one is that the domain has been restricted to only the negative half of the x -axis. where is the erfc function, is the sine integral, is the sinc function, and is the one-argument triangle function. here is applicable to any MATLABinstallation, PC, Mac or UNIX. To use any of these built-in functions you need to be familiar with the shorthand convention MATLAB uses to store polynomials. Matlab also has built-in matrix functions that come in very handy. Did you mean: >> accumarray. The mxcall function calls a given MATLAB function and returns the result; In general, the mat"" custom string literal is the preferred method to interact with the MATLAB engine. Part 1: Write a MATLAB function of the form [L,U,P] = get_lu(A) that accepts a square matrix A and returns the LU decomposition of A with the permutation matrix P. Instructor Curt Frye covers creating MATLAB scripts, accepting user input, extending MATLAB with user-defined functions, controlling flow with conditional logic and. 4 Basic Windows When starting MATLAB on the PC, several windows will appear. Next we want to plat the angle. parameter-list - possibly empty, comma-separated list of the function parameters (see below for details) attr (C++11) - optional list of attributes. However, some functions return results that use much more memory. Create a m-file function which encapsulate your subroutine, and save it to a folder: 2. Matlab Crack is the latest technology graphics software that designs on the basis of algorithm development and data analysis for various. The main function should. So far, you have relied exclusively on built-in functions to perform tasks in MATLAB. MATLAB Coder converting Hello World M script to C or C++ Open Source Code Demo of MATLAB Coder converting Hello World M script to C++ file This is a simple demo of this powerful to demo the conversion of Matlab's M script file to a C++ file for your trading or target platform. This MATLAB function tests along the first array dimension of A whose size does not equal 1, and determines if any element is a nonzero number or logical 1 (true). Scripts are the simplest type of program since they store commands exactly as you would type them at the command line. , any of the characters, 0-to-9) that the file contains. a list of data that can be referenced with a single index. Toolboxes are the name given by the MathWorks to related sets of MATLAB functions aimed at solving a par-ticular class of problems. This makes any particularly useful in if statements: if any(A < 0. Use the MATLAB Live Editor to create MATLAB scripts and functions that combine code, output, and formatted text in an executable notebook. We will explore some of the more common ones below. Add Functions to Scripts. ) If you store all your m-files in the same directory, any function can call any other function. Applying the any function twice to a matrix, as in any(any(A)), always reduces it to a scalar condition. , ode45, ode23) Handle for function containing the derivatives Vector that specifiecs the. Functions applied to a vector. If you use functions in a Matlab script, you are expected to have all code inside of function(s), of which there can be more than one. Add Functions to Scripts. Write a well commented and structured MATLAB function that will generate a square matrix of any size, n, with the following pattern (a 4x4 matrix is shown for example): 1 0 2 0, 0 3 0 4, 5 0 6 0, 0 7 0 8. Because they are variables, function handles can be used to access many different functions, and can even "point to" different functions as the program runs. Many students may find themselves behind on their writing custom functions in matlab studies because of poor time management. The goal of this post is to introduce you to the usage of strings in Matlab and to help you loosen the knot…. It takes a range and produces, by default, 100 points, starting and ending at given arguments. When you supply a gpuArray argument to any GPU-enabled function, the function runs automatically on the GPU. Write a function myprime that takes n, a positive integer,as an input and returns true if n is prime or returns false otherwise. Try help regress to learn how you can run a basic regression in MATLAB. This means that there is a basic mechanism for taking an approximation to the root, and finding a better one. One nice quality of LDA is that, unlike some of the alternatives, it does not require multiple passes over the data for optimization. Ae lay (view profile). See also simxFinish. The MATLAB documentation explicitly states "It is seldom necessary to form the explicit inverse of a matrix. pause(n) pauses execution for n seconds before continuing, where n can be any real number. These functions exist in files whose name ends in a ". Or, you can write a series of commands to a file that you then execute as you would any MATLAB function. From this software we can interact with complex mathematical problems such as matrix problems, functions, data analysis, plotting graphs, signal processing and much more complex engineering and scientific problems. Function Design Pattern. com Learn how to plot any function on an x-y plan (Cartesian plan) in Matlab and adjust the x and y axis. An anonymous function is a simple, typical a single line, user-de ned function that is de ned and written within the computer code (not in a separate le) and is then used in the code. help how to do it in matlab!. MATLAB provides a rich set of functions to work with string arrays. What Is the Function of the Linspace in MATLAB? The "linspace" function in MATLAB creates a vector of values that are linearly spaced between two endpoints. could u please tell me any other command for 'ln'. After entering MATLAB as described in section 1, the command help will display a list of functions for which on-line help is available; the command help functionname will give information about a specific function. image,matlab,image-processing,mask,boundary. One of the thousands of built-in functions in the mathematical software program MATLAB is the "mod" command, short for "modulus. Its not going to work the way you have it written if you call it like "composite_midpoint(x^2)". The neat version. This is done with the two MATLAB® functions called varargin and varargout. py the calls to happyBirthday are inside another function definition (main), so they are not actually run until the function main is run (from the last line, outside any. parameter-list - possibly empty, comma-separated list of the function parameters (see below for details) attr (C++11) - optional list of attributes. Get more lessons like this at http://www. The output, such as variables and result files, from the simulation can also be configured by the user. Any function in the file contains a nested function. This is a plain text file, where the name of the file is the same as the name of the function, and the first line contains the MATLAB keyword function. Typically, you use an output function to generate graphical output, record the history of the data the algorithm generates, or halt the algorithm based on the data at the current iteration. There is not a great deal that can be programmed in MATLAB without using any built-in functions, but a little can be done -- but what, exactly is possible?. Create a m-file function which encapsulate your subroutine, and save it to a folder: 2. Changing the way you enter a command, even subtly can completely change its meaning. The cellstr function converts a character array into a cell array of strings. Ae lay (view profile). remember that any numerical integration, if it is to be accurate, must put many points in any region of importance. A vector in Matlab. MATLAB program to perform the linear convolution of two signals (without using MATLAB function) 28. Multiple Core Jobs. The class function yielding the highest score represents the predicted class. Indeed, vectorization of functions is so important that all the quadrature programs of Matlab require the functions for evaluating integrands to be vectorized. Create a m-file function which encapsulate your subroutine, and save it to a folder: 2. It started out as a matrix programming language where linear algebra programming was simple. The user is advised to proceed with caution when using any of them. This tutorial gives you aggressively a gentle introduction of MATLAB programming language. MATLAB Commands and Functions Dr. Using the string concatenation function, strcat. Now complex operations can be defined that can be done quickly and easily. Using functions, start values and parameter values can be set, and if the model has inputs these can be set. For more information, see Run MATLAB Functions on a GPU. In general, when MATLAB recognizes an identifier (which might name a function or a variable), it analyzes the characters that follow the identifier to determine the type of expression, as follows:. When learning, you can refer here for help. The display starts with the currently executing functions and continues until it reaches the topmost function. For example, MATLAB represents a scalar using a 1-by-1 matrix. Many students ask me how do I do this or that in MATLAB. So how can i get the TF of a model. function s = myApp(n, nslots) % function s = myApp(n, nslots) % Purpose: runs basic MATLAB commands to simulate user code for a standalone demo % n: size of arithmetic sequence [1+2+3+. To use a function, type the name of the function in the command window followed by a parentheses. In MATLAB, you can define a function by placing the function keyword at the start of a line. any(any(eye(3))) ans = 1 See Also. You can call any MATLAB ® function directly and return the results to Python ®. The function is a local function within a script file. The name of the function - that is, how to call it in MATLAB - is determined by the name of the file containing the function. It should not take on the name % of any built-in MATLAB function to avoid conflict. The biggest difference between scripts and functions is that functions have input and output parameters. MATLAB has the capability of running functions written in C. By adding local functions, you can avoid creating and managing separate function files. Here's an example of a data set that needs a two-parameter model to fit it. The first step in speeding up any function is to profile its current run-time behavior using Matlab's builtin Profiler tool, which can either be started from the Matlab Editor toolstrip ("Run and Time") or via the profile function. js, and webgl, no plugins or downloads are required. When you supply a gpuArray argument to any GPU-enabled function, the function runs automatically on the GPU. If the denominator polynomial,a(x), is near a polynomial with multiple roots,then small changes in the data,including roundoff errors,can result in arbitrarily large changes in the resulting poles and residues. Plotly's MATLAB ® graphs are interactive in the web browser. For example, MATLAB represents a scalar using a 1-by-1 matrix. To access this documentation, go to MATLAB Getting Started. Piecewise Functions • We'll show one way to define and plot them in Matlab without using loops. When you call the function at the interactive session prompt or in another script or funtcion m-file, MATLAB searches through a list of directories that it has been told contain functions until it finds an m-file with the appropriate name. The API interface of MATLAB Engine is simple and compact; it contains only 8 functions: Engine *pEng = engOpen(NULL) – function calling the MATLAB desktop, the parameter is always NULL, it returns pointer to the desktop descriptor, it is required for the operation of other functions, the variable is made global. 4 Basic Windows When starting MATLAB on the PC, several windows will appear. 7071 To determine the usage of any function, type help [function name] at the MATLAB command window. Brian Vick Mechanical Engineering Department Virginia Tech Logical Functions any True if any elements are nonzero. This syntax can be captured in a "Design Pattern". h, algorithm, templates, inline, or boost. If A is a matrix, any (A) is equivalent to any (A,1) in Matlab whereas in Scilab or (A) is a logical OR of all elements of A. فى هذا الفيديو يمكنك عمل برنامج قادر على رسم اى دالة باستخدام GUI MATLAB curves, figures, matlab, How to plot in matlab GUI | How to use axes in. Type help colonfor more information. then i will put i step response to see the output the i will make a controller on the TF with SisoTool. If you do not need those variables, they waste space on your system. Indirectly calling a function. The meaning of most of these is clear. MATLAB ® has four signed and four unsigned integer classes. +n] % nslots: number of processors in parallel computing % Compute with the Parallel Computing Toolbox fprintf(1,' Test the parallel computing toolbox. Command and function names in either language when written inline should be in code text format. Most MATLAB functions have been modified (overloaded) so they work with inputs which are vectors as well as scalars. Particular cases. help how to do it in matlab!. Matlab is, to the programmer with experience in almost any other language, a tremendous horror. MatLab is a high performance numeric computing environment, which includes numerical analysis, matrix computation, signal processing, and graphics to provide answers to the most troubling of mathematical problems. To execute a MATLAB function with multiple outputs, specify where to write the output. the MATLAB Desktop Tools and Development Environment documentation. Remember that Matlab has already created a function to find the factorial of the number easily without writing any programs. Matlab any function can work with complexes, what Scilab or can not, so a call to abs function can be necessary when translating from Matlab to Scilab. function (data), rather than a formula for the function. MATLAB (matrix laboratory) is a multi-paradigm numerical computing environment and proprietary programming language developed by MathWorks. MATLAB uses default values for any properties that you do not explicitly define as arguments. Create Function Handle. MATLAB ® scripts, including live scripts, can contain code to define functions. , any int type without a leading u) like. Usually, clustering methods make use of some distance metric (or measure) to group data based on the similarity that is implied by that metric; typically these methods are iterative, improving the prediction of the clusters in each iteration. It started out as a matrix programming language where linear algebra programming was simple. Script files. Run some demos in ~/PRMLT/demo folder. Except for MLPutVar and MLGetVar, you can execute any data management function as a worksheet. If the Level-2 MATLAB S-function defines any additional parameters, you can enter them in the Parameters field of the block's parameter dialog box. Note: if the name of the first function declared in the m-file does not match the file name, it will execute when called by the file name, not the name after the function keyword. A function accepts one or more MATLAB variables as inputs, operates on them in some way, and then. What Is a Function Handle? A function handle is a MATLAB ® data type that stores an association to a function. MATLAB supports a few interesting additions to the standard functions. In general, when MATLAB recognizes an identifier (which might name a function or a variable), it analyzes the characters that follow the identifier to determine the type of expression, as follows:. If you find any sort of problem, you can ask in comments anytime without even feeling any kind of hesitation. Data management functions copy data between Microsoft Excel and the MATLAB workspace. In this case, any(B) yields 1. Add Functions to Scripts. The errors I received are as followed: "Warning: Function loglog has the same name as a MATLAB builtin. ’ Non-conjugate transpose. dbstack displays the line numbers and file names of the function calls that led to the current pause condition, listed in the order in which they execute. If you have any query, please write and discuss with me in the comment. However, to nest any function in a program file, all functions in that file must use an end statement. The book provides a systematic, step-by-step approach, building on concepts throughout. Instead of specifying MATLAB commands directly as the value of a callback property, you can put the commands in a MATLAB program file and specify the file as the value of the callback property. In the following example a very large vector is defined and can be easily manipulated. You typically don't have source code for built-in functions and must treat them simply as black boxes. For more information, see Run MATLAB Functions on a GPU. Function inputs can range from one to many, and the some even take vectors or matrices as inputs. Operator Precedence. A function handle is effectively a variable that tells Matlab where to find a particular function. And naturally, the integration tolerance is important, since if you insist on a better estimate, then it will take more time and effort to get it for you. about a M-Book is that it is interactive---at any time you can execute a MATLAB command and see what it does. MATLAB functions are a relatively new feature in ATLAS 10 and this document is here to help you get started with the basics and preview the capabilities. A MATLAB “function” is a MATLAB program that performs a sequence of operations specified in a text file (called an m-file because it must be saved with a file extension of *. These solvers can be used with the following syntax: [outputs] = function_handle(inputs) [t,state] = solver(@dstate,tspan,ICs,options) Matlab algorithm (e. filter (function, iterable) ¶ Construct an iterator from those elements of iterable for which function returns true. One nice quality of LDA is that, unlike some of the alternatives, it does not require multiple passes over the data for optimization. the MATLAB Desktop Tools and Development Environment documentation. Create function addPerson and include an input parser scheme that uses the validateattributes function. What Is a Function Handle? A function handle is a MATLAB ® data type that stores an association to a function. Ordinarily, each MATLAB function, defined by an M-file, has its own local variables, which are separate from those of other functions, and from those of the base workspace. A user-defined function is a separate file which is usable in any MATLAB program. The function is a local function within a function file, and any local function in the file uses the end keyword. Select the files and then select copy and paste commands from the Edit menu. A simple to use online function plotter with a lot of options for calculating and drawing graphs or charts of mathematical functions and their score tables. Also, you can use copytoImagePlus within a MATLAB function independently of the IJM variable in base workspace. pause, by itself, causes M-files to stop and wait for you to press any key before continuing. Copy file or directory. You must know what function you want to graph because you need to let MATLAB know what independent variables your function has before you write the function. There is not a great deal that can be programmed in MATLAB without using any built-in functions, but a little can be done -- but what, exactly is possible?. m functions are more flexible and more easily extensible. These functions are called local functions. iterable may be either a sequence, a container which supports iteration, or an iterator. If you have any query related to this topic, let's discuss this in the comment section below. MathTutorDVD. As an example, let's consider the R 2 value , commonly used in regression. Matlab any function in C / C++. py, the function calls in lines 9 and 10 were outside any function definition, so they did actually lead to immediate execution of the function. The output, such as variables and result files, from the simulation can also be configured by the user. What I need to do the in the MATLAB to get the proper results. Creating animation in MATLAB is fairly easy and simple. The histogram is created with a patch graphics object. Using Built-in Functions¶. It is similar to the colon operator ":", but gives direct control over the number of points. It will make student life easier. Copy file or directory. One nice quality of LDA is that, unlike some of the alternatives, it does not require multiple passes over the data for optimization. Most MATLAB functions have been modified (overloaded) so they work with inputs which are vectors as well as scalars. Type - Type of function. One way to solve the equation is with x = inv(A)*b. The S-Function Builder also serves as a wrapper for the generated S-function in models that use the S-function. Remember that Matlab has already created a function to find the factorial of the number easily without writing any programs. Information about any function or toolbox is available via the command-line help function (or from the doc command that provides the same information in the Help Browser): help sum In Matlab, everything that can be done using the GUI interface (e. This makes a MATLAB M-Book a powerful learning environment: when you read an explanation of a MATLAB feature, you can immediately try it out. I hope you enjoyed this tutorial. If h is the handle to an existing figure, figure(h) makes the figure identified by h the current figure, makes it visible, and raises it above all other. com Learn how to plot any function on an x-y plan (Cartesian plan) in Matlab and adjust the x and y axis. Find the inverse function of y = x 2 + 1, x < 0. Brian Vick Mechanical Engineering Department Virginia Tech Logical Functions any True if any elements are nonzero. i need to generate an equation using 'ln'(natural logarithm ) funtion in matlab. The resolution of the clock is platform specific. And naturally, the integration tolerance is important, since if you insist on a better estimate, then it will take more time and effort to get it for you. should not have the same name as any matlab functions. MATLAB or any other tool to check your work to make sure it’s correct. Then can be uniquely expressed as the sum of an even function and an odd function. It is intended that in the future the. audioread provides a single, unified Matlab function for reading audio files in a range of different file formats, including wav, mp3, aac, flac, AIFF, etc. So far, you have relied exclusively on built-in functions to perform tasks in MATLAB. See also simxFinish. , ode45, ode23) Handle for function containing the derivatives Vector that specifiecs the. Use computetotalwidth() Avoid compwid(). It is a powerful numerical computing language commonly used in engineering and mathematics. 2 Importing and Exporting Images Before moving ahead with any image processing operations we need to discuss the process of importing and exporting images to/from the MATLAB environment. Scribd is the world's largest social reading and publishing site. Inverse Cotangent. In this section, we introduce some key Matlab concepts and functions that are useful for music and audio. A simple to use online function plotter with a lot of options for calculating and drawing graphs or charts of mathematical functions and their score tables. MATLAB® provides a large number of functions that perform computational tasks. As a math resource, Matlab should easily be able to handle plotting a function: X = linspace (0, 2 * pi); plot(X, sinc(X)); linspace is a useful function in these contexts. You can now evaluate the function value at any given x. If you misspell a MATLAB function, a suggested function name appears in the Command Window. Multiple Core Jobs. MATLAB/Octave Python Description; Any number filled array: eye(3) identity(3) Discrete difference function and approximate derivative:. You can execute these just like any other function in matlab. The first six chapters are designed to serve as the text for an "Introduction to. '); fprintf(1,'Parfor will be used to compute the sum of the arithmetic sequence '); fprintf(1,'s = 1 + 2 + 3 +. You must know what function you want to graph because you need to let MATLAB know what independent variables your function has before you write the function. The theoretical and mathematical background behind Newton-Raphson method and its MATLAB program (or program in any programming language) is approximation of the given function by tangent line with the help of derivative, after choosing a guess value of root which is reasonably close to the actual root. Its not going to work the way you have it written if you call it like "composite_midpoint(x^2)". Instructor Curt Frye covers creating MATLAB scripts, accepting user input, extending MATLAB with user-defined functions, controlling flow with conditional logic and. Step 1, Open MATLAB on your computer. All the scripts given to you are actually MATLAB scripts and could be directly called my writing their name of the file in the. As an example of where we may want to use one of these plotting routines, consider the following problem:. [email protected] Circular convolution also know as cyclic convolution to two functions which are aperiodic in nature occurs when one of them is convolved in the normal way with a periodic summation of other function. This method preserves any trailing spaces in the input arrays. The original question "Can anyone tell me if there is a way (in MATLAB) to check whether a certain value is equal to any of the values stored within another array?" can be solved without any loop. Inverse Cotangent. Write a Matlab script to use QGis functions After setting up the QGis environment, we can now call the QGis functions from within Matlab. Make sure to start an appropriate remote API server service on the server side, that will wait for a connection. It is not uncommon for students to be assigned questions which they are required to complete "without using any built-in functions". As you are still in school , so i'll not count its engineering application. There is not a great deal that can be programmed in MATLAB without using any built-in functions, but a little can be done -- but what, exactly is possible?. Select the files and then select copy and paste commands from the Edit menu. This means that there is a basic mechanism for taking an approximation to the root, and finding a better one. It is factorial(n), and you can find the documentation of the factorial function in matlab from here: Factorial of input - Matlab. To get general MATLAB help, type help at the MATLAB command prompt to get a list of a help topics. And it's not mat lab it's MATLAB MATLAB is a software made by company mathworks. Other functions that collapse an array's dimensions include max, mean, median, min, prod, std, sum, and trapz.