plinproj.c
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	#include <math.h>
	#include "mex.h"
	#include "geometry.h"

	void
	mexFunction (int nlhs, mxArray * plhs[], int nrhs, const mxArray * prhs[])
	{
	char str[256];
	mxArray proj, dist;
	double l1, l2, r, proj_p, *dist_p;
	int flag;

	if (nrhs <3 \|\| nrhs>4)
	mexErrMsgTxt ("Invalid number of input arguments");

	if (mxGetM(prhs[0])!=1 \|\| mxGetN(prhs[0])!=3)
	mexErrMsgTxt ("Invalid dimension for input argument 1");
	if (mxGetM(prhs[1])!=1 \|\| mxGetN(prhs[1])!=3)
	mexErrMsgTxt ("Invalid dimension for input argument 2");
	if (mxGetM(prhs[2])!=1 \|\| mxGetN(prhs[2])!=3)
	mexErrMsgTxt ("Invalid dimension for input argument 3");

	l1 = mxGetData (prhs[0]);
	l2 = mxGetData (prhs[1]);
	r = mxGetData (prhs[2]);

	if (nrhs==4)
	flag = (int)mxGetScalar (prhs[3]);
	else
	flag = 0;

	proj = mxCreateDoubleMatrix (1, 3, mxREAL);
	dist = mxCreateDoubleMatrix (1, 1, mxREAL);
	proj_p = mxGetData (proj);
	dist_p = mxGetData (dist);

	(*dist_p) = plinproj(l1, l2, r, proj_p, flag);

	/* assign the output parameters */
	plhs[0] = proj;
	if (nlhs>1)
	plhs[1] = dist;

	return;
	}