abs.c
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	/*
	*
	* Copyright (C) 2006-2007, Robert Oostenveld
	*
	* This implements [y] = abs(x)
	*
	* This function does not check the occurence of integer overflowing.
	*
	*/

	#include <math.h>
	#include "mex.h"
	#include "matrix.h"

	void
	mexFunction (int nlhs, mxArray * plhs[], int nrhs, const mxArray * prhs[])
	{
	size_t M, N;
	UINT64_T x, y;
	int i;

	if (nlhs > 2)
	mexErrMsgTxt ("Invalid number of output arguments");
	if (nrhs > 1)
	mexErrMsgTxt ("Invalid number of input arguments");

	if (!mxIsUint64(prhs[0]))
	mexErrMsgTxt ("Invalid type of input arguments (should be uint64)");

	M = mxGetM(prhs[0]);
	N = mxGetN(prhs[0]);

	plhs[0] = (mxArray*)mxCreateNumericMatrix(M, N, mxUINT64_CLASS, mxREAL);
	x = mxGetData(prhs[0]);
	y = mxGetData(plhs[0]);

	for (i=0; i<(M*N); i++)
	y[i] = x[i]; /* the absolute value of an unsigned integer is identical to the original value */

	return;
	}