MATLAB Application Program Interface Reference

ANSI C printf-style output routine

#include "mex.h"
int mexPrintf(const char *format, ...);

Arguments

format, ...

ANSI C printf-style format string and optional arguments.

Description

This routine prints a string on the screen and in the diary (if the diary is in use). It provides a callback to the standard C printf routine already linked inside MATLAB, and avoids linking the entire stdio library into your MEX-file.

In a MEX-file, you must call mexPrintf instead of printf.

Examples

Consider a MEX-file named DispComp that expects two input arguments and determines which of them has the larger first element.

void
mexFunction(int nlhs,mxArray *plhs[],int nrhs,const mxArray 
*prhs[])
{
 mxArray  *array_ptr;
 double    value_in_first_array, value_in_second_array; 
 
 /*Get the value of the first element in both input arrays.*/ 
   value_in_first_array = mxGetScalar(prhs[0]); 
   value_in_second_array = mxGetScalar(prhs[1]); 
   if (value_in_first_array > value_in_second_array)
     mexPrintf("%g is greater than %g.\n", 
                 value_in_first_array, value_in_second_array);  
   else 
     mexPrintf("%g is not greater than %g.\n", 
                 value_in_first_array, value_in_second_array);
}

In MATLAB, create two vectors:

>> a=[53 2 17];
>> b=[65 14 23 99 57];

Pass v1 and v2 as arguments to DispComp:

>> DispComp(v1, v2)
53 is not greater than 65.

For an additional example, see mexPrintf.c in the mex subdirectory of the examples directory.