How to pass a vector<float> (1D) from C++ into MATLAB for plotting?

I'm having some trouble with creating a MATLAB data array in a C++ environment that is composed of data from a vector<float> (1-dimensional) - I don't need to work with this data in MATLAB itself as there is no processing, in this case I'm just using it for it's plotting capabilities.

So far I know that you can use createArray (called on an arrayFactory object) to create a MATLAB array, but this only accepts an initializer_list as an argument, not a dynamic array.

For some context, once it is a workable array in MATLAB I plan to use the eval function to plot it directly from the C++ environment.

Answer 1

[Uday Pradhan]

Hi Angad,

You can use "createArray" with C++ vector iterators as well. Please refer to this link for more details. I have created a small example of how you can use a C++ vector of doubles and plot it in MATLAB itself.

#include <iostream>
#include "MatlabDataArray.hpp"
#include "MatlabEngine.hpp"

int main()
{
    using namespace matlab::engine;
    std::unique_ptr<MATLABEngine> matlabPtr = startMATLAB();

    //Create MATLAB data array factory
    matlab::data::ArrayFactory factory;
    
    std::vector <double> vec(4);
    vec[0] = 1.0,vec[1] = 2.0,vec[2] = -9.2,vec[3] = -0.9;
    int dim = vec.size();
    matlab::data::TypedArray<double> const argArray = factory.createArray({1,dim},vec.begin(),vec.end());
    matlabPtr->feval(u"plot", argArray);
    return 0;
}

Hope this helps!