Hi,
I tried executing your code with the particulars provided in the CMakeLists.txt with MATLAB R2022b libraries.
This is my CMakeLists.txt:
cmake_minimum_required(VERSION 3.10)
project(ML_Answers)
find_package(Matlab "9.13.0.2553342"EXACT COMPONENTS MX_LIBRARY MAT_LIBRARY DATAARRAY_LIBRARY)
include_directories(${Matlab_INCLUDE_DIRS})
add_executable(ML_Answers main.cpp)
target_link_libraries(ML_Answers PRIVATE Matlab::mat)
I built and ran the project using the following commands:
$ cmake -G "MinGW Makefiles" -DCMAKE_CXX_COMPILER=C:\ProgramData\MATLAB\SupportPackages\R2022b\3P.instrset\mingw_w64.instrset\bin\g++.exe .
$ mingw32-make.exe
$./ML_Answers.exe
This executes as expected. I encountered the issue you mentioned when I built the project in a different build subdirectory (instead of the project root directory) and tried executing the executable from inside the build subdirectory. This was due to the relative path of the CompactSVMModel.mat file not being correct. You might try rechecking to see if you made a similar error.
For the task of reading a class instance from CompactSVMModel.mat file using a standalone C++ program, a workaround would be to save the different properties as different variables in the CompactSVMModel.mat file as follows:
% Extract the SupportVectors property
SupportVectors = CompactSVMModel.SupportVectors;
save('CompactSVMModel.mat', 'SupportVectors', 'CompactSVMModel');
Following this, the SupportedVectors variable can be read using C++ program in the following way (I substituted qDebug() for std::cerr and std::cout):
#include "mat.h"
#include <string>
#include <iostream>
int main() {
std::string stdFilename = "./CompactSVMModel.mat";
const char* variableName = "SupportVectors"; // Change to read the SupportVectors property
// Open the MAT-File
MATFile *matFile = matOpen(stdFilename.c_str(), "r");
if (!matFile) {
std::cerr << "Error opening MAT file: " << stdFilename << std::endl;
return 1; // Exit with error code
}
// Read the variable from the MAT-File
mxArray *dataArray = matGetVariable(matFile, variableName);
if (!dataArray) {
std::cerr << "Error reading variable: " << variableName << " from MAT file: " << stdFilename << std::endl;
matClose(matFile);
return 1; // Exit with error code
}
// Print the dimensions of the SupportVectors matrix
mwSize numRows = mxGetM(dataArray);
mwSize numCols = mxGetN(dataArray);
std::cout << "SupportVectors dimensions: " << numRows << " x " << numCols << std::endl;
// Clean up and close the MAT-File
mxDestroyArray(dataArray);
matClose(matFile);
std::cout << "SupportVectors have been successfully read from the MAT file." << std::endl;
return 0;
}
Output for the C++ Program:
SupportVectors dimensions: 89 x 2
SupportVectors have been successfully read from the MAT file.
You can learn more about how to read variables here:
Alternatively, you can build your project using MEX and use C++ MEX API. You can read more about the C++ MEX API here:
