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<title>Cell Arrays with Mex-Files - Untitled</title>
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<h4 class="subsection">A.2.4 Cell Arrays with Mex-Files</h4>
<p>We can perform exactly the same operations in Cell arrays in mex-files
as we can in oct-files. An example that reduplicates the functional of
the <samp><span class="file">celldemo.cc</span></samp> oct-file in a mex-file is given by
<samp><span class="file">mycell.c</span></samp> as below
<pre class="example"><pre class="verbatim"> #include "mex.h"
void
mexFunction (int nlhs, mxArray* plhs[], int nrhs,
const mxArray* prhs[])
{
mwSize n;
mwIndex i;
if (nrhs != 1 || ! mxIsCell (prhs[0]))
mexErrMsgTxt ("expects cell");
n = mxGetNumberOfElements (prhs[0]);
n = (n > nlhs ? nlhs : n);
for (i = 0; i < n; i++)
plhs[i] = mxDuplicateArray (mxGetCell (prhs[0], i));
}
</pre>
</pre>
<p class="noindent">which as can be seen below has exactly the same behavior as the oct-file
version.
<pre class="example"> [b1, b2, b3] = mycell ({1, [1, 2], "test"})
b1 = 1
b2 =
1 2
b3 = test
</pre>
<p>Note in the example the use of the <code>mxDuplicateArray</code> function. This
is needed as the <code>mxArray</code> pointer returned by <code>mxGetCell</code>
might be deallocated. The inverse function to <code>mxGetCell</code> is
<code>mcSetCell</code> and is defined as
<pre class="example"> void mxSetCell (mxArray *ptr, int idx, mxArray *val);
</pre>
<p>Finally, to create a cell array or matrix, the appropriate functions are
<pre class="example"> mxArray *mxCreateCellArray (int ndims, const int *dims);
mxArray *mxCreateCellMatrix (int m, int n);
</pre>
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