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mxGetElementSize (Fortran)

Number of bytes required to store each data element

For a complex mxArray built with the interleaved complex API, mxGetElementSize returns twice the value that the function in the separate complex API returns.

Fortran Syntax

#include "fintrf.h"
mwPointer mxGetElementSize(pm)
mwPointer pm



Pointer to an mxArray


Number of bytes required to store one element of the specified mxArray, if successful. Returns 0 on failure. The primary reason for failure is that pm points to an mxArray having an unrecognized class. If pm points to a cell or structure, then mxGetElementSize returns the size of a pointer. The function does not return the size of all the elements in each cell or structure field.


Call mxGetElementSize to determine the number of bytes in each data element of the mxArray. For example, if the MATLAB® class of an mxArray is int16, the mxArray stores each data element as a 16-bit (2-byte) signed integer. Thus, mxGetElementSize returns 2.

mxGetElementSize is helpful when using a non-MATLAB routine to manipulate data elements.


Fortran does not have an equivalent of size_t. mwPointer is a preprocessor macro that provides the appropriate Fortran type. The value returned by this function, however, is not a pointer.

See Also


Introduced before R2006a