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det3x3.c
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Wed, May 28, 10:46

det3x3.c
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#include <math.h>
#include <mex.h>
void mexFunction(int nlhs, mxArray *plhs[], int nrhs, const mxArray *prhs[])
{
/*declare variables*/
const mwSize *dims;
mwSize *dimsout;
mwIndex indx;
int i, numdims;
int numelin;
mxClassID classid;
double *input1r, *input1i, *output1r, *output1i;
double a, b, c, d, e, f, g, h, j;
double ai, bi, ci, di, ei, fi, gi, hi ,ji;
/*figure out the classid*/
classid = mxGetClassID(prhs[0]);
/*check inputs*/
if (nrhs>1)
mexErrMsgTxt("Too many input arguments");
/*associate inputs*/
input1r = mxGetData(prhs[0]);
input1i = mxGetImagData(prhs[0]);
/*figure out dimension info and number of elements*/
dims = mxGetDimensions(prhs[0]);
numdims = mxGetNumberOfDimensions(prhs[0]);
numelin = mxGetNumberOfElements(prhs[0]);
dimsout = mxMalloc(numdims * sizeof(mwSize));
for (i=0; i<numdims; i++)
{
dimsout[i] = dims[i];
}
dimsout[0] = 1;
dimsout[1] = 1;
/*associate output*/
if (input1i == NULL)
{
plhs[0] = mxCreateNumericArray(numdims, dimsout, classid, mxREAL);
output1r = mxGetData(plhs[0]);
}
else
{
plhs[0] = mxCreateNumericArray(numdims, dimsout, classid, mxCOMPLEX);
output1r = mxGetData(plhs[0]);
output1i = mxGetImagData(plhs[0]);
}
/* do the computation*/
if (input1i == NULL)
{
for (i=0; i<numelin/9; i++)
{
a = input1r[i*9 ];
b = input1r[i*9+1];
c = input1r[i*9+2];
d = input1r[i*9+3];
e = input1r[i*9+4];
f = input1r[i*9+5];
g = input1r[i*9+6];
h = input1r[i*9+7];
j = input1r[i*9+8];
output1r[i] = a*e*j - a*h*f - d*b*j + d*h*c +g*b*f - g*e*c;
}
return;
}
else
{
for (i=0; i<numelin/9; i++)
{
/*matrix 1*/
a = input1r[i*9 ]; b = input1r[i*9+1]; c = input1r[i*9+2]; d = input1r[i*9+3];
e = input1r[i*9+4]; f = input1r[i*9+5]; g = input1r[i*9+6]; h = input1r[i*9+7];
j = input1r[i*9+8];
ai = input1i[i*9 ]; bi = input1i[i*9+1]; ci = input1i[i*9+2]; di = input1i[i*9+3];
ei = input1i[i*9+4]; fi = input1i[i*9+5]; gi = input1i[i*9+6]; hi = input1i[i*9+7];
ji = input1i[i*9+8];
/*fill in the real part of the output matrix*/
output1r[i] = (a*e*j-ai*ei*j-a*ei*ji-ai*e*ji) - (a*h*f-ai*hi*f-a*hi*fi-ai*h*fi) - (d*b*j-di*bi*j-d*bi*ji-di*b*ji) + (d*h*c-di*hi*c-d*hi*ci-di*h*ci) + (g*b*f-gi*bi*f-g*bi*fi-gi*b*fi) - (g*e*c-gi*ei*c-g*ei*ci-gi*e*ci);
/*fill in the imaginary part of the output matrix*/
output1i[i] = (a*ei*j+ai*e*j+a*e*ji-ai*ei*ji) - (a*hi*f+ai*h*f+a*h*fi-ai*hi*fi) - (d*bi*j+di*b*j+d*b*ji-di*bi*ji) + (d*hi*c+di*h*c+d*h*ci-di*hi*ci) + (g*bi*f+gi*b*f+g*b*fi-gi*bi*fi) - (g*ei*c+gi*e*c+g*e*ci-gi*ei*ci);
}
return;
}
}

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