Mexfunction Example

Rather, mexFunction is the generic name of the function entry point that must exist in every C source MEX-file. mex wont compile propperly, missing mexFunction?. I have a MEX function written in C and it is calling a MATLAB file. I'm pretty sure all memory you have allocated with mex functions will be deallocated. A major challenge in doing psychophysics on modern personal computers is that operating systems are becoming more and more aggressive about stealing time away from your display code to do other things. FACT is an example in which a C++ function is used to compute the factorial function. Basically I need to have the Mex Function have 2 parameters which are both strings, and will be passed through to C++ functions inside. , nimming) objects from distinct heaps or piles. We will be working with mex-files written in C (actually, since many C compilers also understand C++, we may use some C++ features also). maximum elements. > Hi everybody, I have a problem compiling CUDA example files. When you invoke a MEX function, MATLAB ® finds and loads the corresponding MEX function of the same name. Here is the basic design of a C++ MEX function. the M-or MEX-function. Additional MEX examples Advanced MEX options 19. By continuing to browse this site, you agree to this use. 1 mex function A mexfunction is a Matlab executable, allowing you to run routines written in C++ (or C or Fortan) directly in Matlab, in the style of a Matlab function. To pass data between the MEX file and the MATLAB workspace, use the mexGetVariable and mexPutVariable functions. To build the MEX function, follow the instructions in the topics listed in the More Information column. m placed next to the compiled MEX function +cv/filter2D. I want to send a nested struct through a mex file myvar. However, I can't figure out how to access this string data after passing it to the MEX function. Greg's pick this week is Example MATLAB class wrapper for a C++ class by Oliver Woodford. The MATLAB ® Data API supports array types that enable MEX functions to pass specific data types from and to MATLAB. m uses mex function to efficiently plot SSFP transients as a function of frequency. mexFunction is not a routine you call. Create mexFunction for C source code. The MAX function can be used to return the largest value from a set of data. mexFunction example Input array has two elements Output array has one element 0. 1 x64, MATLAB R2015a, CUDA 6. c void mexFunction( int nlhs, mxArray *plhs[], int nrhs, const mxArray *prhs[]) In the gateway routine: Use the mxCreate functions to create the MATLAB arrays for your output arguments. This array type supports the use of a range-based for loop, which is used to multiply each element in the array by 2. Steps to compile and test:. Matlab mex-function wrapper for Assimp tool. MATLAB_CALLS_F90 is a directory of MATLAB programs which illustrate how a MATLAB program can call a FORTRAN90 function, passing data to the function, and receiving results from the FORTRAN90 function. Writing a "Hello World" MEX-file 14. But when I call the mex function, it doesn't printf anything and stays there. You have a C++ class that you would like to instantiate in MATLAB. mexFunction is not a routine you call. I want to send a nested struct through a mex file myvar. Function class. Use the stand-alone Runge-Kutta and BDF's integrators in MATLAB. The gateway routine is the entry point to the MEX file. filename is the example name, and release-option specifies the API used by the example. The coding is done in such a way that the computation is in a separate FORTRAN77 function; the mexFunction is only used to "translate" between MATLAB and C. As an example, let us create a data structure that contains the information for a single student. Recall that MEX (Matlab-EXecutable) files are dynamically linked subroutines from C/C++ code (or Fortran code) that, when compiled, can be run from within Matlab like M-files. I think I've narrowed down the problem but anytime I try to fix anything Matlab shuts down. The inline command lets you create a function of any number of variables by giving a string containing the function followed by a series of strings denoting the order of the input variables. For example on our Win 7 OSes running on Intel core i7 2. But it's easy to test, simply start your system monitor to see how much memory you have available, run your MEX function that allocates a large chunck of memory and then throws a mexErrMsgTxt("mesg"), and see what happens to the memory. The model consists of a set of C functions that reside in a shar ed library. So, my question is: how do I get Matlab to run a large C++ program? It has about 20 cpp files which call upon each other to run the program. This document is intended only as a suplimental document, to explain the few elements you need to compile a mex function in Visual C++ 6. MEX Function Build with Visual Studio. MEX-files are dynamically linked subroutines produced from C or Fortran source code that, when compiled, can be run from within MATLAB in the same way. The MexFunction class that you implement in C++ MEX functions must inherit from the matlab. If command_name is an operator, just place the operator inside a pair of single quotes; for example, '+'. mexFunction is not a routine you call. MEX-files • are subroutines produced from C or Fortran source code • behave just like M-files and built-in functions • while M-files have a platform-independent extension,. In this example, we will write an anonymous function named power, which will take two numbers as input and return first number raised to the power of the second number. The example assumes a basic understanding of MEX files as described in Create C Source MEX File. The kit contains a couple of C++ classes and macros to make MEX development easy in Matlab. If one launches the MEX function, and realises a parameter is wrong, the only way to stop execution is by forcibly killing Matlab itself and restarting everything again. Open sfuntmpl_doc. I compiled without errors. obj file format reader in MATLAB. Function class enables access to the C++ Engine API and defines a virtual operator() function that your MexFunction class must override. 1, but would need to be recompiled to be compatible with the current Psychtoolbox. Functions and subroutines are FORTRAN's subprograms. So, my question is: how do I get Matlab to run a large C++ program? It has about 20 cpp files which call upon each other to run the program. please guide to me i have C++ program that is long and complete algorithm however i call this program from matlab because i have some difficulty to rewrite this C code to m file. Thank you, I found a library for SVM which doesnt require MEX function at all. output = myMEXFunction(input); This instance continues to exist until you call the MATLAB clear mex command. I illustrate one example here – implementing a ZLB algorithm. c, the source code of the C function. Matlab mex-function wrapper for Assimp tool. This seems like it should be simple, but I can't get either it to compile or not fail during runtime. MATLAB then searches for a symbol named mexFunction within the MEX function. Learn more about functions, mex, mex compiler MATLAB. Learn more about mex. MEX -Files are similar in that they always start execution from a special function called the mexFunction. When you invoke a MEX-function, MATLAB finds and loads the corresponding MEX-file of the same name. cpp like below. In the following files, you can try to build a test mex function. exe actually runs \bin\w64\matlab. As an example, let us create a data structure that contains the information for a single student. mexFunction is not a routine you call. dlib have toMat function to do that but i am unable to use it properly, so can you provide an program example using toMat function to convert dlib image. cpp file directly to use the MEX API. Troubleshooting and Limitations Compiling C/C++ MEX Files with MinGW-w64 Do Not Link to Library Files Compiled with Non-MinGW CompilersIf you use the MinGW ® compiler to build a MEX file that links to a library compiled with a non-MinGW compiler, such as Microsoft ® Visual Studio ®, the file will not run in MATLAB ®. : substitute void mexFunction(int nlhs, mxArray *plhs,int nrhs, mxArray *prhs[]) by void mexFunction(int nlhs, mxArray *plhs[ ],int nrhs, const mxArray *prhs[]) These corrections should solve the above mentioned problems. Rather, mexFunction is the generic name of the function entry point that must exist in every C source MEX-file. In your case you may want to use a forever loop and then have something within the loop trigger an exit. The entry point into the mex-file is defined by mexFunction. Xu, Can i know at which place in your coding I should change the single dimension to two dimension. Note that the function name definition is not explicitly included in mexFunction and so there can only be a single mexFunction entry point per file. If command_name is an operator, just place the operator inside a pair of single quotes; for example, '+'. Learn more about functions, mex, mex compiler MATLAB. Worked with Psychtoolbox version 2. To call a MEX function, use the name of the file, without the file extension. The following statements document the MEX function. lib and dlldemo. Example of output of the command: >>MexJSBSim('help') function usage: result = MexJSBSim( string_directive [, string, value] ) Examples: res = MexJSBSim('help');. The requirements for creating MEX files are listed in C Source MEX Files. Examples Example 1 : Using the EMPLOYEE table, set the host variable MAX_SALARY (decimal(7,2)) to the maximum monthly salary (SALARY/12) value. For an additional example, see phonebook. It takes in two values: a double array "par" that contains the true mean and. > Hi everybody, I have a problem compiling CUDA example files. Welcome to the home page for Field II! Here you will find all the information about the program along with executables and examples that you can download. mexcuda is an extension of the MATLAB mex function. For information about the MATLAB APIs, see MEX Applications. To test whether the compiler is set correctly, type the following command in the Matlab Command Window. As with any m-file the function name is determined according to file name. This package includes a tutorial, MATLAB examples, and the source code. It takes in two values: a double array ”par” that contains the true mean and standard deviation and an integer ”N” that is the sample size. Is it possible to have a variable that I set in the MEX function and then use in the MATLAB file? Here is what I have so far:. m, a MATLAB M file which compiles C code and uses it. any doubles (such as variable "a") are okay but any vectors are not okay. A major challenge in doing psychophysics on modern personal computers is that operating systems are becoming more and more aggressive about stealing time away from your display code to do other things. Note that the function name is not explicitly included in the mexFunction and so there can only be a single mexFunction entry point per-file. Using your editor, create a file with a. To build an example MEX function in MATLAB or at your operating system prompt, use this command syntax. The MEX file must be on the MATLAB path or in the current working folder when called. MATLAB gives the name, var_name, to the copied mxArray in the receiving workspace. Components of MEX File mexFunction Gateway Routine. mexw64 exist, then foo(3,4) in MATLAB will invoke foo. There is a separate chapter with the API Reference documentation. Create mexFunction for C source code. W3Schools is optimized for learning, testing, and training. This example convec. mexcuda is an extension of the MATLAB mex function. (Note that, despite the naming convention, this is a Numerical Recipes, not a MathWorks, function. Of course, a MATLAB call normally looks something like [ out1, out2 ] = function_name ( in1, in2, in3 ). lib and playing the sound file. You can call your own C, C++, or Fortran subroutines from the MATLAB ® command line as if they were built-in functions. MEX Function Build with Visual Studio. Set plhs[0], [1], to the pointers to the newly created MATLAB arrays. We will be working with mex-files written in C (actually, since many C compilers also understand C++, we may use some C++ features also). Dependency Walker is a free utility that scans any 32-bit or 64-bit Windows module (exe, dll, ocx, sys, etc. Suppose we are given the following data about several runners, along with their start and finish times: We can use the SMALL function to retrieve the nth lowest value from a set of data, that is, the first, second, or third fastest times in a race. The following instructions will setup gcc 4. c), there are two functions in the example MEX file. To call a MATLAB function, use mexCallMATLAB or mexEvalString. The coding is done in such a way that the computation is in a separate FORTRAN77 function; the mexFunction is only used to "translate" between MATLAB and C. MATLAB_CALLS_F90 is a directory of MATLAB programs which illustrate how a MATLAB program can call a FORTRAN90 function, passing data to the function, and receiving results from the FORTRAN90 function. m, a MATLAB M file which compiles C++ code and uses it. the first call takes 0. Suppose we are given the following data about several runners, along with their start and finish times: We can use the SMALL function to retrieve the nth lowest value from a set of data, that is, the first, second, or third fastest times in a race. dlib have toMat function to do that but i am unable to use it properly, so can you provide an program example using toMat function to convert dlib image. B = max(A, [], dim) CS 1173: MATLAB max function. 3 Calling C and Fortran Programs from MATLAB Although MATLAB is a complete, self-contained environment for programming and manipulating data, it is often useful to interact with data and programs external to the MATLAB environment. See LICENSE_FOR_EXAMPLE_PROGRAMS. c takes two complex row vectors and convolves them. m, a MATLAB M file which compiles C++ code and uses it. , nimming) objects from distinct heaps or piles. MATLAB then searches for a symbol named mexFunction within the MEX-file. Introduction. Calling the MEX function from MATLAB instantiates the function object, which maintains its state across subsequent calls to the same MEX function. The user can specify the position of the source and the receiver at each discrete time instance. The python object can be manipulated by python calls like pycall and pyexec without needing to do an explicit conversion. c void mexFunction( int nlhs, mxArray *plhs[], int nrhs, const mxArray *prhs[]) In the gateway routine: Use the mxCreate functions to create the MATLAB arrays for your output arguments. Install The GNU Compiler Collection 4. I'd suggest reading the CUDA by Example book as a start for the CUDA part. Using MEX Files. Rather, mexFunction is the name of the gateway function in C which every MEX function requires. This should give you the following output: MEX configured to use 'MinGW64 Compiler (C++)' for C++ language compilation. Example for building mex function. that the main-function of the mex-files is not correctly named (see here). Recall that MEX (Matlab-EXecutable) files are dynamically linked subroutines from C/C++ code (or Fortran code) that, when compiled, can be run from within Matlab like M-files. In the following files, you can try to build a test mex function. the second call only 0. Mex files - an example. You can call your own C, C++, or Fortran subroutines from the MATLAB ® command line as if they were built-in functions. 2016/10/26: fixed mex-function incompatibility with MatlabR2015b ; Acknowledgements. If you declare it as:. > Hi everybody, I have a problem compiling CUDA example files. Copy the computational subroutine to your current folder. The procedure is actually pretty easy once you know how. c and sfuntmpl_doc. Click here to see To view all translated materials including this page, select Country from the country navigator on the bottom of this page. We thank those who had made suggestions and reported bugs to make SDPT3 better. One is (void) arrayProduct(double, double*,double*,int). The MEX-function in this example multiplies every element in the input array by 2 to get the values in the output array. In particular, we thank Johan Lofberg for bug reports while incorporating SDPT3 into YALMIP. Dynamics: An overview of the model building process with. GitHub Gist: instantly share code, notes, and snippets. However, all of the tutorials and example I have found, including on the Mathworks site, are for relatively short C++ functions. mex wont compile propperly, missing mexFunction?. So, my question is: how do I get Matlab to run a large C++ program? It has about 20 cpp files which call upon each other to run the program. You can also call the C/C++ interface using S-function. mex -setup C++. For example, this MATLAB statement creates an instance of the MexFunction class defined by the myMEXFunction. The supported compilers depend on the CUDA Toolkit version supported by MATLAB. when a name in C conflicts with a Python keyword, you can use a C name specification to give different Cython and C names to the C function at declaration time. As an example, we will look at a mex-file for computing the 4-connected components of an image. Speed; you can rewrite bottleneck computations (like for-loops) as a MEX-file for efficiency. Using your editor, create a file with a. GLM: How can I keep the clicked point under mouse when rotating? opengl,graphics,linear-algebra,glm,arcball. If you have. and should be a good primer for any mex function. As with any m-file the function name is determined according to file name. m After running "compile. Sometimes when a matlab *. In this tutorial we show how to train your own structured forest using author's initial Matlab implementation. Learn more about matlab compiler, mex compiler, simulink, visual studio. I am pleased to introduce guest blogger Arvind Ananthan. For example, this MATLAB statement creates an instance of the MexFunction class defined by the myMEXFunction. Locate the. Arguments can be provided as constants, or as cell references or ranges, for example: =. FACT is an example in which a C function is used to compute the factorial function. Most problems that require a computer program to solve them are too complex to sit down and work all the way through them in one go. h" include void mexFunction(int nlhs, mxArray *plhs[], int nrhs,. h MEX function argument wrappers. mexFunction is not a routine you call. Of course, a MATLAB call normally looks something like [ out1, out2 ] = function_name ( in1, in2, in3 ). mexopencv is a private project independent of the official Matlab module. and should be a good primer for any mex function. Note: Starting OpenCV 3. Examples of mex source code can be found in this document (and elsewhere) copy them to a file with the *. B = max(A, [], dim) CS 1173: MATLAB max function. All of the relevant functions (mxGetChars, mxGetString, mxArrayToString, etc) seem to only work with mxChar arrays, and the more generic functions are unable to parse or even understand a string array object. eigen_example. The MATLAB ® Data API supports array types that enable MEX functions to pass specific data types from and to MATLAB. A single routine is used, which takes care of the "translation" between MATLAB and C++, and the computation of the result. See mexfunction. maximum elements. To call a MEX function, use the name of the file, without the file extension. Is it possible to have a variable that I set in the MEX function and then use in the MATLAB file? Here is what I have so far:. MATLAB news, code tips and tricks, questions, and discussion! We are here to help, but won't do your homework or help you pirate software. Modify the. my computer core i7 920 with gtx 470. LIB files for the compiler version you are using under matlabroot\extern\lib\win32\microsoft. Function class enables access to the C++ Engine API and defines a virtual operator() function that your MexFunction class must override. Presumably what you'd like to do is copy the in pointer to GPU memory and do whatever operations is it you intend to do on it. any doubles (such as variable "a") are okay but any vectors are not okay. Then edit the Makefile to (a) aim at the locations of your CUDA and Matlab installations and (b) have the proper source code filename (The example below is set if your code is named yourcode. ) These functions let you grab scalar values, either from your mex function's arguments, or from variables in the Matlab workspace. mexximp is a Matlab interface to the Assimp tool. To test it, start with a gpuArray in which every element is 1: x = ones(4,4, 'gpuArray' ); y = mexGPUExample(x). c and mxgetscalar2. ) OMPC is a platform that makes it easy to move from MATLAB® to Python. 3 and make it the default compiler for MATLAB: 1. MATLAB news, code tips and tricks, questions, and discussion! We are here to help, but won't do your homework or help you pirate software. m -> Test of adding 2 Eigen Vectors of type 'double' - also checks if wrong type is used. , nimming) objects from distinct heaps or piles. If you want to use your own C development environment, see Custom Build with MEX Script Options for more information. How to pass values of an array to the output argument of an Mex-function Showing 1-7 of 7 messages. Rather, mexFunction is the generic name of the function entry point that must exist in every C source MEX-file. This example demonstrates code generation for an image segmentation application that uses deep learning. • MEX function and class to support MATLAB ® software integration Overview This user guide provides information about the Xilinx LogiCORE IP FIR Compiler v6. Math Forum » Discussions » Software » comp. If multiple representations of the same decimal floating-point value are found (for example, 2. c in the mex subdirectory of the examples directory. For the next release we will try to optimize the this be a single check per MATLAB session. we need to first create a grid of points within the domain using the function meshgrid. Though, when accessing the cells of a multidimensional array in which the last dimension is an enough large power of two, you can drop into the data cache contention phenomenon (aka data cache conflict ), that may slow down. As i said i have no knowlege of how to write mexfunction. My example code is basically doing the same thing as that code regarding the cleanup. Many LAPACK and BLAS functions modify the values of arguments passed to them. I compiled without errors. mexFunction is not a routine you call. This example uses the MATLAB Editor to write the source code and the MATLAB mex command to create the MEX function. In Example 2: Array arr is a five-dimensional array. In the following files, you can try to build a test mex function. Note: This page has been translated by MathWorks. We have implemented such an example in the mex function mex_sum_openmp. A Jupyter notebook Modelica mode, available in OpenModelica. This example performs feature extraction, which is the first step of the SURF algorithm. The usage in Matlab is as follows (note how matrix1 is updated in-place):. Note this is a warning - the MEX function will still compile. It seems the string is not passed to following function. In some cases, you will be required to use the SQL GROUP BY clause with the SQL MAX function. cpp file, the function can be complied and called in the Matlab* platform as they were build-in functions. It is through this routine that MATLAB ® accesses the rest of the routines in your MEX files. cpp file to yield '. MEX -Files are similar in that they always start execution from a special function called the mexFunction. Note: Starting OpenCV 3. You can import 3D scene files using the Assimp importer, read and modify scene data, create scenes from scratch, and export scenes using the Assimp exporter. On each turn, a player must remove at least one object, and may remove any number of objects provided they all come from the same heap/pile. m, a MATLAB M file which compiles C code and uses it. txt #include "dlib/matrix. You do realize that this MexFunction source is already in C language, yes? This is why it is a MEX file a Matlab EXecutable. After looking around I was unable to find a single example, so I had to develop my own. I want to send a nested struct through a mex file myvar. You can call your own C, C++, or Fortran subroutines from the MATLAB ® command line as if they were built-in functions. Checking inputs and outputs via a MEX-file 16. The usage in Matlab is as follows (note how matrix1 is updated in-place):. Checking inputs and outputs via a MEX-file 16. Create Source File. I do not know how to compile a mexfunction in cygwin. Then edit the Makefile to (a) aim at the locations of your CUDA and Matlab installations and (b) have the proper source code filename (The example below is set if your code is named yourcode. We will be working with mex-files written in C (actually, since many C compilers also understand C++, we may use some C++ features also). MATLAB news, code tips and tricks, questions, and discussion! We are here to help, but won't do your homework or help you pirate software. If n is zero stones, the nimber is 0 because the mex of the empty set of legal moves is the nimber 0. c void mexFunction( int nlhs, mxArray *plhs[], int nrhs, const mxArray *prhs[]) In the gateway routine: Use the mxCreate functions to create the MATLAB arrays for your output arguments. Our first result of this work was proving that. and should be a good primer for any mex function. MEX -Files are similar in that they always start execution from a special function called the mexFunction. C MEX S-Function Examples About S-Function Examples. The following statements document the MEX function. For example, MyMEXFunction. (Note that, despite the naming convention, this is a Numerical Recipes, not a MathWorks, function. Decision making is an important part of programming. The inline command lets you create a function of any number of variables by giving a string containing the function followed by a series of strings denoting the order of the input variables. Troubleshooting and Limitations Compiling C/C++ MEX Files with MinGW-w64 Do Not Link to Library Files Compiled with Non-MinGW CompilersIf you use the MinGW ® compiler to build a MEX file that links to a library compiled with a non-MinGW compiler, such as Microsoft ® Visual Studio ®, the file will not run in MATLAB ®. These can be very useful if we want to run numerical routines which are much faster in programming languages other than Matlab's, while. These programs, called binary MEX files, are dynamically linked subroutines that the MATLAB interpreter loads and executes. It is through this routine that MATLAB ® accesses the rest of the routines in your MEX files. The requirements for creating MEX files are listed in C Source MEX Files. This array type supports the use of a range-based for loop, which is used to multiply each element in the array by 2. We will be working with mex-files written in C (actually, since many C compilers also understand C++, we may use some C++ features also). #include "matrix. maximum elements. A gateway routine that interfaces the computational routine with MATLAB by the entry point mexFunction and its parameters prhs, nrhs, plhs, nlhs, where prhs is an array of right-hand input arguments, nrhs is the number of right-hand input arguments, plhs is an array of left-hand output arguments, and nlhs is the number of left-hand output. Hello Davis, I have found very useful information about dlib & OpenCV on your forum. Passing arrays between MEX-files and MATLAB 17. We thank those who had made suggestions and reported bugs to make SDPT3 better. Call mexPutVariable to copy the mxArray, at pointer array_ptr, from your MEX-function into the specified workspace. For information about the C MEX file gateway routine, see Components of MEX File. Description. Recall that MEX (Matlab-EXecutable) files are dynamically linked subroutines from C/C++ code (or Fortran code) that, when compiled, can be run from within Matlab like M-files. The algorithm used here is based on the OpenSURF library implementation. For example, this MATLAB statement creates an instance of the MexFunction class defined by the myMEXFunction. To run this example, you need a supported Fortran compiler installed on your system. This can be achieved in R programming using the conditional ifelse statement. - The LabVIEW Run-Time needs to be install to use the DLL. Code Generation for Semantic Segmentation Network. cu) Key lines in the "nvopts. To test it, start with a gpuArray in which every element is 1: x = ones(4,4, 'gpuArray' ); y = mexGPUExample(x). Rather, mexFunction is the generic name of the function entry point that must exist in every C source MEX-file. lib and playing the sound file. h" double mxGetScalar(const mxArray *array_ptr); Arguments. Data Types for Passing MEX Function Data. Click here to see To view all translated materials including this page, select Country from the country navigator on the bottom of this page. mysubfield, where subfield is a 3-d position vector. The structure example is: typedef struct info_cb{ uint16 type int32 bloc FILE *fp uint16 *data } I am trying to write a mex function to call this encode() from matlab. C++ Matlab MEX development kit. Gensys C++ mex function and Julia comparison. This tells me that the global variable I declared inside of the MEX function is not accessable in the MATLAB function. The MATLAB ® Data API supports array types that enable MEX functions to pass specific data types from and to MATLAB. the second call only 0. In this article, you will learn to create if and if…else statement in R programming with the help of examples. Greg’s pick this week is Example MATLAB class wrapper for a C++ class by Oliver Woodford. For example LIBRARY MYFILE. This number is reached by multiplying the value of each dimension. Example - Using SQL GROUP BY Clause In some cases, you will be required to use the SQL GROUP BY clause with the SQL MAX function. Is it possible to have mex-function calls in other mex-functions? if yes, how do I go about it? I tried to have 2 mex functions f1. Examples: CHEBY_U is an example in which a FORTRAN77 function is used to compute the Chebyshev U polynomial. Our array can hold 500 integer-type elements. See LICENSE_FOR_EXAMPLE_PROGRAMS. Matlab max function can work with complexes, what Scilab max can not, so a emulation function called mtlb_max has been written. Rather, mexFunction is the name of the gateway function in C which every MEX function requires. Let's start with an example and find the sum of foo(x) where foo is a moderately complicated function and x is a large number of values. 3 and The GNU Standard C++ Library. The Computer Engineering program combines the best of electrical engineering and computer science. Name of the MATLAB built-in function, operator, user-defined function, or MEX function to call specified as const char*. Suppose we are given the following data about several runners, along with their start and finish times: We can use the SMALL function to retrieve the nth lowest value from a set of data, that is, the first, second, or third fastest times in a race.