The ability to automatically redirect the Command Window output to stdout or stderr is not available in MATLAB 7.8 (R2009a).
There are two possible workarounds.
First, you could write your own wrapper console application which makes use of MATLAB Engine to:
1. Execute commands (using "engEvalString")
2. Capture the output (using "engOutputBuffer")
3. Redirect the output to stdout or stderr (using "fprintf")
A sample application written in C is given below (this example can also be downloaded at the bottom of this page):
/* File: mlcaller.c */
#include <stdio.h>
#include "engine.h"
#define BUFFERSIZE 255
int main(int argc, char *argv[]) {
Engine *en;
int res;
char buffer[BUFFERSIZE];
/* Open connection to MATLAB */
en = engOpen(NULL);
/* Define that Command Window output should be written to buffer */
engOutputBuffer(en, buffer, BUFFERSIZE);
/* Pass the input argument to MATLAB */
res = engEvalString(en, argv[1]);
/* Check if an error occured. Error messages usually start with "???" */
if (buffer[0]!='?') {
fprintf(stdout,"%s\n",buffer);
} else {
fprintf(stderr,"%s\n",buffer);
}
/* Close the engine */
engClose(en);
}
This example can be compiled in MATLAB using:
mex('-f', [matlabroot '\bin\' computer('arch') '\mexopts\lccengmatopts.bat'], 'mlcaller.c');
Once compiled you can use this application as follows:
mlcaller "myMatlabFunction; myOtherFunction;"
Second, If MATLAB is being launched from the command line to execute a script in batch mode, then there is an indirect solution that may be simpler. For this example, we will assume that the script you want to run inside MATLAB is called "myscript.m".
Step 1: Produce a file containing all output to the command window. One way to do this is to create a wrapper script in MATLAB using the DIARY function, and save it (for example) as 'displaymyscript.m':
% Turn on recording of the command window output
diary('outfile.txt');
% Execute your script
myscript;
% Turn recording back off
diary off;
Step 2: Create a windows batch file to send the contents of the file you just created to the screen. The example batch file below accomplishes this using the TYPE command
@echo off
matlab -r displaymyscript -nosplash -nodesktop -wait
type outfile.txt
Executing the batch file rather than launching MATLAB directly from the command line will result in the command window output being displayed at the OS command prompt. Since this approach first creates a text file containing MATLAB command line output, an output is only displayed once the MATLAB script finishes execution, and the batch script reaches the TYPE command to display it on the console.
