Accessing elements in an mxArray that contains only numbers

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Caroline
Caroline 2013-7-29
I am using the MATLAB engine and xlsread to read an excel spreadsheet. I use xlsread in the following way:
engEvalString(ep, "[num, text, raw] = xlsread('C:\\rest_of_file_path', 'Data'");
However when I try to use mxGetCell(num,1) or any other index (i.e. mexGetCell(num, 0), mxGetCell(num, 30), mxGetCell(num,4)) it throws the following exception:
Access violation reading location 0x3f7a9fc7.
But when I use either text or raw instead of num it doesn't throw an exception. For example, the following two statements throw no exceptions:
mxGetCell(raw,1)
mxGetCell(text,1)
Does anyone know why this could be happening?
Thanks!

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