Cell arrays are passed exactly as any other type. I assume, your question concerns the usage of a cell inside a C-mex.
mxArray *c1, *c2;
double *OutputPtr;
plhs[0] = mxCreateDoubleMatrix(numBlocksN, numBlockO, mxREAL);
OutputPtr = mxGetPr(plhs[0]);
for (r = 0; r < numBlocksN; r++) {
c1 = mxGetCell(prhs[2], r);
for (c = 0; c < numBlocksO; c++) {
c2 = mxGetCell(prhs[3], c);
*OutputPtr++ = blockDistance(c1, c2); % EDITED: * added
end
end
Now lockDistance(c1, c2) gets pointers to the cell elements. Depending on your function lockDistance, you might need further e.g. mxGetPr calls.
BTW, your M-version can be made a littlte bit faster also:
L = zeros(numBlocksN, numBlocksO);
for c = 1:numBlocks0
c2 = cell2{c};
for r = 1:numBlocksN
L(r,c) = blockDistance(cell1{r}, c2);
end
end
In addition I would inline blockDistance and I guess it can be vectorized.
