External Interfaces Reference

mxGetNumberOfFields

Get number of fields in structure mxArray

Fortran Syntax

• integer*4 function mxGetNumberOfFields(pm)
  integer*4 pm
  

Arguments

pm
   Pointer to a structure mxArray.

Returns

The number of fields, on success. Returns 0 on failure of if no fields exist. The most common cause of failure is that pm is not a structure mxArray. Call mxIsStruct to determine if pm is a structure.

Description

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

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

See Also

mxGetField, mxIsStruct, mxSetField

mxGetNumberOfElements

mxGetNzmax

© 1994-2005 The MathWorks, Inc.