MATLAB Application Program Interface Reference

Control response of mexCallMATLAB to errors

#include "mex.h"
void mexSetTrapFlag(int trap_flag);

Arguments

trap_flag

Control flag. Currently, the only legal values are

0 On error, control returns to the MATLAB prompt.
1
On error, control returns to your MEX-file.

`0`	`On error, control returns to the MATLAB prompt.`
`1`	On error, control returns to your MEX-file.

Description

Call mexSetTrapFlag to control MATLAB's response to errors in mexCallMATLAB.

If you do not call mexSetTrapFlag, then whenever MATLAB detects an error in a call to mexCallMATLAB, MATLAB automatically terminates the MEX-file and returns control to the MATLAB prompt. Calling mexSetTrapFlag with trap_flag set to 0 is equivalent to not calling mexSetTrapFlag at all.

If you call mexSetTrapFlag and set the trap_flag to 1, then whenever MATLAB detects an error in a call to mexCallMATLAB, MATLAB does not automatically terminate the MEX-file. Rather, MATLAB returns control to the line in the MEX-file immediately following the call to mexCallMATLAB. The MEX-file is then responsible for taking an appropriate response to the error.

Example

See mexSetTrapFlag.c in the mex subdirectory of the examples directory.