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

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Jaehong Lee
Jaehong Lee on 20 Sep 2019
Commented: Denis Riedijk on 4 Mar 2021
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

Answers (1)

Kritika Bansal
Kritika Bansal on 10 Jan 2020
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
  1 Comment
Denis Riedijk
Denis Riedijk on 4 Mar 2021
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)

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