User`s manual

2 Creating C Language MEX-Files

2-24

arithmetic on data of 8-, 16- or 32-bit precision in MEX-files and return the

result to MATLAB, which will recognize the correct data class. Although from

within MATLAB it is not currently possible to perform arithmetic or to call

MATLAB functions that perform data manipulation on data of 8-, 16-, or 32-bit

precision, you can display the data at the MATLAB prompt and save it in a

MAT-file.

This example constructs a 2-by-2 matrix with unsigned 16-bit integers, doubles

each element, and returns both matrices to MATLAB.

#include <string.h> /* Needed for memcpy() */

#include "mex.h"

* doubleelement.c - Example found in API Guide

* Constructs a 2-by-2 matrix with unsigned 16-bit integers,

* doubles each element, and returns the matrix.

* This is a MEX-file for MATLAB.

/* $Revision: 1.8 $ */

#define NDIMS 2

#define TOTAL_ELEMENTS 4

/* The computational subroutine */

void dbl_elem(unsigned short *x)

{

unsigned short scalar = 2;

int i,j;

for(i = 0; i < 2;i++) {

for(j = 0; j < 2;j++) {

*(x+i+j) = scalar * *(x+i+j);

}