Best way to get a Matlab <-> C++ interface [closed]

Question

I have a C++ Windows Program and I want to convert and visualize some data from this C++ app in an existing Matlab Program.

Currently I am writing the data from the C++ app into files. At the same time the Matlab app reads the files and processes the data. (polling) It basically works but I am running in performance troubles when the data load gets to high.

What is the best solution to transfer data between this programs? I am thinking of a kind of message queue or socket interface.

Answer 1

Use the Matlab API to send your data from C++ to Matlab, then execute a plot command on it. Roughly, do the following -- there are no error checks, but the gist is there:

#include <engine.h>
//open the engine
Engine *m_engine;
m_engine = engOpen("\0");

//put our data
//pretend this is a 2 column, n row matrix, so we can do a 2D plot
mxArray* mx = mxCreateDoubleMatrix(mat->n_rows, mat->n_cols, mxREAL);
memcpy(mxGetPr(mx),some_data,data->n_elem*sizeof(double));
put("data",mx);
mxDestroyArray(mx);

//plot
engEvalString(m_engine, "plot(data(:,1),data(:,2),'-o')");

Just remember, Matlab works in column major, while C++ is row major.