How do I pass data of pointer to output without factory.createArray() in mex c++?

I want to use c++ based program processing large data by pointer on matlab workspace.

So I've made mex c++ function like

 TypedArray<std::complex<double>> complexArray = std::move(inputs[0]);
 
 //get pointer of input
 std::complex<double> *temp = complexArray.release().release();

 //some processing using *temp
 //under 0.7sec
 //processing end
 
//almost 7 sec
 outputs[0] = factory.createArray<std::complex<double>>({dimensionX,dimensionY}, temp, temp+dimensionX*dimensionY);
 

but this way is too slow where factory.createArray()

processing time is almost under 0.7sec, but elapsed time of of createArray is 7sec

I also have used factory.createBuffer() and factory.createArrayFromBuffer(). This way is much faster than createArray, but slower than processing yet.

I want to make output from pointer without the overhead of creating Array

Answer 1

[Kritika Bansal]

Hi,

You can use the function mxCreateDoubleMatrix to create a 2D matrix. One of the parameters is ComplexFlag which needs to be set to true if you need a complex double array.

For more information, you can refer the documentation here: https://www.mathworks.com/help/matlab/apiref/mxcreatedoublematrix.html

[Denis Riedijk]

mxCreateDoubleMatrix is the C API, not the C++ API, so I am afraid this will not help. (trying to solve an issue I am having I came across this question and answer)