mexGetArrayPtr (External Interfaces/API Reference)

Get a read-only pointer to a variable from another workspace

C Syntax

#include "mex.h"
const mxArray *mexGetArrayPtr(const char *name,
   const char *workspace);

Arguments
name
Name of a variable in another workspace. (Note that this is a variable name, not an mxArray pointer.)

workspace

Specifies which workspace you want mexGetArrayPtr to search. The possible values are:


`base`	Search the current variables of MATLAB.
`caller`	Search the current variables of whatever entity (M-file, another MEX-file, MATLAB workspace) called this MEX-file.
`global`	Search the current global variables of MATLAB only.

Returns

A read-only pointer mxArray called name on success. Returns NULL on failure.

Description

Call mexGetArrayPtr to get a read-only copy of the specified variable name into your MEX-file's workspace. This command is useful for examining an mxArray's data and characteristics, but useless for changing them. If you need to change data or characteristics, call mexGetArray instead of mexGetArrayPtr. If you simply need to examine data or characteristics, mexGetArrayPtr offers superior performance as the caller need pass only a pointer to the array. By contrast, mexGetArray passes back the entire array.

Example

See mxislogical.c in the mx subdirectory of the examples directory.

See Also

mexGetArray

mexGetArray mexGetEps (Obsolete)