MATLAB: Problem with set field by number

cMATLAB C/C++ Math Librarymxsetfieldbynumber

Hi
I am having a problem using mxSetFieldByNumber. I want to set fields in a N-D structure array. I have no problem with setting fields in a Nx1 structure array. With a Nx1 structure array index is set as a int and corresponds to the element I want to write data.
int index;
field_num = mxGetFieldNumber(pa, "field_name");
mxSetFieldByNumber(pa, index, field_num, new_value_pa);
But with a N-D structure array I cant seem to find a way to write data to the second column in the array. I if I Have a 6×2 structure array I can set data to the first column in the array by setting the index to 1…6. I tried to set index 7 but then the structure array is changed to a array with dimensions of 7×2.
What should I do to populate the second column of the array? Thank You Joachim

Best Answer

Using index=7 is the perfect method to set the [1 x 2] elements of a [6 x N] array, e.g. a struct array also. So please post a piece of code, which reproduces your problem. You cannot change the size of a (struct)-array inside C++ only by writing to a non-existent index. While this works in Matlab, it crashes the memory manager in C++. So perhaps all you see is a severe bug.
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