This is machine translation

Translated by Microsoft
Mouse over text to see original. Click the button below to return to the English verison of the page.

mxGetNumberOfFields (C and Fortran)

Number of fields in structure array

C Syntax

#include "matrix.h"
int mxGetNumberOfFields(const mxArray *pm);

Fortran Syntax

integer*4 mxGetNumberOfFields(pm)
mwPointer pm



Pointer to a structure mxArray


Number of fields, on success. Returns 0 on failure. The most common cause of failure is that pm is not a structure mxArray. Call mxIsStruct to determine whether pm is a structure.


Call mxGetNumberOfFields to determine how many fields are in the specified structure mxArray.

Once you know the number of fields in a structure, you can loop through every field to set or to get field values.


See the following examples in matlabroot/extern/examples/refbook.

See the following examples in matlabroot/extern/examples/mx.

See the following examples in matlabroot/extern/examples/mex.

Introduced before R2006a

Was this topic helpful?