MATLAB: MwArray& varargin initialize

MATLAB Compilermwarray varargin

function plotSignals(varargin)….end

I use mcc to convert it to C++ syntax. varargin is a variable parameter,it can receive dynamic parameters,but in MFC type of varargin is mwArray, how can I initialize this variable? I need to convert three strings to varargin.

I have tried this:

const char* str2[]={"EngSpeed","CurrentGear","filename"};

mwArray my_struct(3,1,3,str2);

but it doesnot make a difference….

Thank you for your help!

Best Answer

You need to create a cell array as follows:

mwArray input(1, 3, mxCELL_CLASS);
mwArray arg1("EngSpeed");
mwArray arg2("CurrentGear");
mwArray arg3("filename");
input.Get(1,1).Set(arg1);
input.Get(1,2).Set(arg2);
input.Get(1,3).Set(arg3);

Also, this Technical Solution explains the answer with an example.

Related Solutions

MATLAB: Calling Matlab from C++: How to pass in no arguments in varargin

Looks like this is not possible:

http://www.mathworks.com/help/compiler/matlab-compiler-generated-interface-functions.html

"Caution The C++ shared library interface does not support varargin with zero (0) input arguments. Calling your program using an empty mwArray results in the compiled library receiving an empty array with nargin = 1. The C shared library interface allows you to call mlfFOO(NULL) (the compiled MATLAB code interprets this as nargin=0). However, calling FOO((mwArray)NULL) with the C++ shared library interface causes the compiled MATLAB code to see an empty array as the first input and interprets nargin=1."

MATLAB: How to call a MATLAB Compiler 4.4 (2006a) generated shared library function that has variable number of input arguments from the C++ application

The attached example files demonstrate calling a C++ shared library function which uses VARARGIN and VARARGOUT.

To execute the example code, perform the following steps:

1. Download the files vararg_example.cpp and makeplot.m to your current directory.

2. At the MATLAB prompt, compile the MATLAB file makeplot.m into a C++ shared library with the command:

 mcc -B cpplib:libplot makeplot.m

3. Compile the C++ program with the command:

 mbuild vararg_example.cpp libplot.lib

4. Execute the resulting EXE file from the MATLAB prompt:

 !vararg_example.exe

Alternatively, the EXE can be executed from the DOS prompt in the current directory:

 vararg_example.exe

The following modifications on "vararg_example.cpp" can be done to pass fewer arguments to the MAKEPLOT library function:

1. For passing no input arguments to MAKEPLOT, replace the following block of code:

mwArray input(1, 2, mxCELL_CLASS);
// Assign values to cell array "input":
mwArray range(1, 2, mxDOUBLE_CLASS);
range(1,1) = 5;
range(1,2) = 10;   // Range of data to be plotted.
mwArray title("Random numbers between 5 and 10"); // Plot title
input.Get(1,1).Set(range);
input.Get(1,2).Set(title);

with

mwArray input;

Best Answer

Related Solutions

MATLAB: Calling Matlab from C++: How to pass in no arguments in varargin

MATLAB: How to call a MATLAB Compiler 4.4 (2006a) generated shared library function that has variable number of input arguments from the C++ application

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