the trouble with mex c

  • Thread starter Martijn van den Branden
  • Start date
M

Martijn van den Branden

Hi,

sorry if this message gets posted twice, i seem to have some problem posting
to newsgroups.

i've rewritten some loop in matlab using the mex interface method in c, and
i've achieved a reduction in calculation time of about five hours :).
however, the resulting arrays
are not the same as with matlab. this is the first time i write something in
c, and i suspect i'm making some
mistakes that causes memory regions to be overwritten, pointers to be
misused, that sort of thing that
doesn't make the lcc compiler shipped with matlab complain. i've got no
debugger and after rereading c and
mex documentation i've got no clue what to do. would someone care to take a
glance at the code
and maybe identify some beginners mistake that causes the erroneous results?
I can send the code
as an attachment.

I would greatly appreciate that,

Martijn
 
P

Peter Pichler

Martijn van den Branden said:
Hi,
Click to expand...
would someone care to take a glance at the code
and maybe identify some beginners mistake that causes the erroneous results?
I can send the code
as an attachment.
Click to expand...

Don't send in an attachment, trim it down to a reasonable size (no more than
a few KB, but take care not to cut out the bits that show the problem) and
post it here.

Peter
 
M

Martijn van den Branden

I've included the full code below, but at places i've deleted declarations
of variables
where they are obvious replaced by ...

Thanks in advance,

Martijn



____________________________________________________________________________
#include "mex.h"
#include <math.h>
#define PI 3.14159

void source (double x, double y, double z, double x1, double y1, double z1,
double x2, double y2, double z2, double x3, double y3, double
z3,
double x4, double y4, double z4, double *srcphi, double
*dblphi)
{

ALL DECLARATIONS OF THE LOCAL VARIABLES IN THE
EQUATIONS BELOW GO HERE.

*(srcphi) = -1.0/(4*PI)*(
(
(((x-x1)*(y2-y1)-(y-y1)*(x2-x1))/d12)*log((r1+r2+d12)/(r1+r2-d12)) +
(((x-x2)*(y3-y2)-(y-y2)*(x3-x2))/d23)*log((r2+r3+d23)/(r2+r3-d23)) +
(((x-x3)*(y4-y3)-(y-y3)*(x4-x3))/d34)*log((r3+r4+d34)/(r3+r4-d34)) +
(((x-x4)*(y1-y4)-(y-y4)*(x1-x4))/d41)*log((r4+r1+d41)/(r4+r1-d41))
)
+fabs(z)*(
atan((m12*e1-h1)/(z*r1)) - atan((m12*e2-h2)/(z*r2)) +
atan((m23*e2-h2)/(z*r2)) - atan((m23*e3-h3)/(z*r3)) +
atan((m34*e3-h3)/(z*r3)) - atan((m34*e4-h4)/(z*r4)) +
atan((m41*e4-h4)/(z*r4)) - atan((m41*e1-h1)/(z*r1))
)
);

*(dblphi) = -1.0/(4*PI)*(
atan((m12*e1-h1)/(z*r1)) - atan((m12*e2-h2)/(z*r2))
+ atan((m23*e2-h2)/(z*r2)) - atan((m23*e3-h3)/(z*r3))
+ atan((m34*e3-h3)/(z*r3)) - atan((m34*e4-h4)/(z*r4))
+ atan((m41*e4-h4)/(z*r4)) - atan((m41*e1-h1)/(z*r1)));

return;
}




void coefficientmatrix(int totpanelsf, int totpanelswake, double eps,
double *xcf, double *ycf, double *zcf,
double *x1f, double *y1f, double *z1f,
double *x2f, double *y2f, double *z2f,
...
...
double *xe2wake, double *ye2wake, double
*ze2wake,
double *xe3wake, double *ye3wake, double
*ze3wake,
double *z1wakeqs, double *z2wakeqs, double
*z3wakeqs, double *z4wakeqs,
double *A, double *S, double *E)
{
int i,j,k,count = 0,count2=0;
double xp, yp, zp;
double pcolloc[3], p1[3], p2[3], p3[3], p4[3];
double srcphi, dblphi;

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

xp = xcf-nxf*eps;
yp = ycf-nyf*eps;
zp = zcf-nzf*eps;

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

pcolloc[0] = xe1[j]*(xp-xcf[j])+ye1[j]*(yp-ycf[j])+ze1[j]*(zp-zcf[j]);
pcolloc[1] = xe2[j]*(xp-xcf[j])+ye2[j]*(yp-ycf[j])+ze2[j]*(zp-zcf[j]);
pcolloc[2] = nxf[j]*(xp-xcf[j])+nyf[j]*(yp-ycf[j])+nzf[j]*(zp-zcf[j]);

p1[0] =
xe1[j]*(x1f[j]-xcf[j])+ye1[j]*(y1f[j]-ycf[j])+ze1[j]*(z1fqs[j]-zcf[j]);
p1[1] =
xe2[j]*(x1f[j]-xcf[j])+ye2[j]*(y1f[j]-ycf[j])+ze2[j]*(z1fqs[j]-zcf[j]);
p1[2] =
nxf[j]*(x1f[j]-xcf[j])+nyf[j]*(y1f[j]-ycf[j])+nzf[j]*(z1fqs[j]-zcf[j]);

p2[0] =
xe1[j]*(x2f[j]-xcf[j])+ye1[j]*(y2f[j]-ycf[j])+ze1[j]*(z2fqs[j]-zcf[j]);
p2[1] =
xe2[j]*(x2f[j]-xcf[j])+ye2[j]*(y2f[j]-ycf[j])+ze2[j]*(z2fqs[j]-zcf[j]);
p2[2] =
nxf[j]*(x2f[j]-xcf[j])+nyf[j]*(y2f[j]-ycf[j])+nzf[j]*(z2fqs[j]-zcf[j]);

p3[0] =
xe1[j]*(x3f[j]-xcf[j])+ye1[j]*(y3f[j]-ycf[j])+ze1[j]*(z3fqs[j]-zcf[j]);
p3[1] =
xe2[j]*(x3f[j]-xcf[j])+ye2[j]*(y3f[j]-ycf[j])+ze2[j]*(z3fqs[j]-zcf[j]);
p3[2] =
nxf[j]*(x3f[j]-xcf[j])+nyf[j]*(y3f[j]-ycf[j])+nzf[j]*(z3fqs[j]-zcf[j]);

p4[0] =
xe1[j]*(x4f[j]-xcf[j])+ye1[j]*(y4f[j]-ycf[j])+ze1[j]*(z4fqs[j]-zcf[j]);
p4[1] =
xe2[j]*(x4f[j]-xcf[j])+ye2[j]*(y4f[j]-ycf[j])+ze2[j]*(z4fqs[j]-zcf[j]);
p4[2] =
nxf[j]*(x4f[j]-xcf[j])+nyf[j]*(y4f[j]-ycf[j])+nzf[j]*(z4fqs[j]-zcf[j]);

source(pcolloc[0],pcolloc[1],pcolloc[2],p1[0],p1[1],p1[2],
p2[0],p2[1],p2[2],p3[0],p3[1],p3[2],
p4[0],p4[1],p4[2],&srcphi, &dblphi);

*(S+count)= srcphi;
*(A+count)= dblphi;
count++;
}

for (k=0;k<totpanelswake;k++)
{

pcolloc[0] =
xe1wake[k]*(xp-xcwake[k])+ye1wake[k]*(yp-ycwake[k])+ze1wake[k]*(zp-zcwake[k]
);
pcolloc[1] =
xe2wake[k]*(xp-xcwake[k])+ye2wake[k]*(yp-ycwake[k])+ze2wake[k]*(zp-zcwake[k]
);
pcolloc[2] =
xe3wake[k]*(xp-xcwake[k])+ye3wake[k]*(yp-ycwake[k])+ze3wake[k]*(zp-zcwake[k]
);

p1[0] =
xe1wake[k]*(x1wake[k]-xcwake[k])+ye1wake[k]*(y1wake[k]-ycwake[k])+ze1wake[k]
*(z1wakeqs[k]-zcwake[k]);
p1[1] =
xe2wake[k]*(x1wake[k]-xcwake[k])+ye2wake[k]*(y1wake[k]-ycwake[k])+ze2wake[k]
*(z1wakeqs[k]-zcwake[k]);
p1[2] =
xe3wake[k]*(x1wake[k]-xcwake[k])+ye3wake[k]*(y1wake[k]-ycwake[k])+ze3wake[k]
*(z1wakeqs[k]-zcwake[k]);

p2[0] =
xe1wake[k]*(x2wake[k]-xcwake[k])+ye1wake[k]*(y2wake[k]-ycwake[k])+ze1wake[k]
*(z2wakeqs[k]-zcwake[k]);
p2[1] =
xe2wake[k]*(x2wake[k]-xcwake[k])+ye2wake[k]*(y2wake[k]-ycwake[k])+ze2wake[k]
*(z2wakeqs[k]-zcwake[k]);
p2[2] =
xe3wake[k]*(x2wake[k]-xcwake[k])+ye3wake[k]*(y2wake[k]-ycwake[k])+ze3wake[k]
*(z2wakeqs[k]-zcwake[k]);

p3[0] =
xe1wake[k]*(x3wake[k]-xcwake[k])+ye1wake[k]*(y3wake[k]-ycwake[k])+ze1wake[k]
*(z3wakeqs[k]-zcwake[k]);
p3[1] =
xe2wake[k]*(x3wake[k]-xcwake[k])+ye2wake[k]*(y3wake[k]-ycwake[k])+ze2wake[k]
*(z3wakeqs[k]-zcwake[k]);
p3[2] =
xe3wake[k]*(x3wake[k]-xcwake[k])+ye3wake[k]*(y3wake[k]-ycwake[k])+ze3wake[k]
*(z3wakeqs[k]-zcwake[k]);

p4[0] =
xe1wake[k]*(x4wake[k]-xcwake[k])+ye1wake[k]*(y4wake[k]-ycwake[k])+ze1wake[k]
*(z4wakeqs[k]-zcwake[k]);
p4[1] =
xe2wake[k]*(x4wake[k]-xcwake[k])+ye2wake[k]*(y4wake[k]-ycwake[k])+ze2wake[k]
*(z4wakeqs[k]-zcwake[k]);
p4[2] =
xe3wake[k]*(x4wake[k]-xcwake[k])+ye3wake[k]*(y4wake[k]-ycwake[k])+ze3wake[k]
*(z4wakeqs[k]-zcwake[k]);

source(pcolloc[0],pcolloc[1],pcolloc[2],p1[0],p1[1],p1[2],
p2[0],p2[1],p2[2],p3[0],p3[1],p3[2],
p4[0],p4[1],p4[2],&srcphi, &dblphi);

*(E+count2)= dblphi;
count2++;
}

}
return;
}



void mexFunction (int nlhs, mxArray *plhs[],
int nrhs, const mxArray *prhs[])
{

/* Input variables */

int totpanelsf, totpanelswake;
double eps;

double *xcf, *ycf, *zcf;
double *x1f, *y1f, *z1f;
double *x2f, *y2f, *z2f;
double *x3f, *y3f, *z3f;
double *x4f, *y4f, *z4f;
double *xe1, *ye1, *ze1;
double *xe2, *ye2, *ze2;
double *nxf, *nyf, *nzf;
double *z1fqs, *z2fqs, *z3fqs, *z4fqs;

double *xcwake, *ycwake, *zcwake;
double *x1wake, *y1wake, *z1wake;
double *x2wake, *y2wake, *z2wake;
double *x3wake, *y3wake, *z3wake;
double *x4wake, *y4wake, *z4wake;
double *xe1wake, *ye1wake, *ze1wake;
double *xe2wake, *ye2wake, *ze2wake;
double *xe3wake, *ye3wake, *ze3wake;
double *z1wakeqs, *z2wakeqs, *z3wakeqs, *z4wakeqs;

/* Output variables */

double *A, *S, *E;


/* Assign scalars to input */

totpanelsf = mxGetScalar(prhs[0]);
totpanelswake = mxGetScalar(prhs[1]);
eps = mxGetScalar(prhs[2]);

/* Assign pointers to input */

xcf = mxGetPr(prhs[3]);
.....
.....
z3wakeqs = mxGetPr(prhs[57]);
z4wakeqs = mxGetPr(prhs[58]);

/* Create Matrices for the outputs */

plhs[0] = mxCreateDoubleMatrix(totpanelsf,totpanelsf,mxREAL);
plhs[1] = mxCreateDoubleMatrix(totpanelsf,totpanelsf,mxREAL);
plhs[2] = mxCreateDoubleMatrix(totpanelsf,totpanelswake,mxREAL);


/* Assign pointers to output */

A = mxGetPr(plhs[0]);
S = mxGetPr(plhs[1]);
E = mxGetPr(plhs[2]);

/* Call the coefficient matrix C subroutine */

coefficientmatrix(totpanelsf,totpanelswake,eps,
xcf, ycf, zcf,
x1f, y1f, z1f,
x2f, y2f, z2f,
x3f, y3f, z3f,
x4f, y4f, z4f,
xe1, ye1, ze1,
xe2, ye2, ze2,
nxf, nyf, nzf,
z1fqs, z2fqs, z3fqs, z4fqs,
xcwake, ycwake, zcwake,
x1wake, y1wake, z1wake,
x2wake, y2wake, z2wake,
x3wake, y3wake, z3wake,
x4wake, y4wake, z4wake,
xe1wake, ye1wake, ze1wake,
xe2wake, ye2wake, ze2wake,
xe3wake, ye3wake, ze3wake,
z1wakeqs, z2wakeqs, z3wakeqs, z4wakeqs,
A, S, E);
return;
}
 
C

CBFalconer

Peter said:
Don't send in an attachment, trim it down to a reasonable size
(no more than a few KB, but take care not to cut out the bits
that show the problem) and post it here.
Click to expand...

But make sure it is still a compilable complete program. Cut and
paste it, with neither tabs nor // comments, and keep line lengths
below 72.
 
M

Martin Ambuhl

Martijn said:
I've included the full code below, but at places i've deleted declarations
of variables
where they are obvious replaced by ...
Click to expand...

This is hopeless. Don't post uncompilable code. Deleting the declarations
is close to antisocial. #including a non-standard header is silly; if we
can't see what's there, it doesn't exist.
 
M

Martijn van den Branden

I'm sorry, but i must say your reaction is close to antisocial. like i said
in my first message, i've close to no experience writing in c and i would
be very grateful if someone could point out some erroneous c syntax
from looking at the code, if there should be any, i didn't mean to offend
anyone.
I cut out some code because the first person to respond to my question
advised it.
AndI thought that if i'm lucky people that have experience writing mex files
might read my question and point me in some direction. I'm sure to them
mex.h is familiar, if still non-standard.
 
M

Martijn van den Branden

ok, here it comes again :). thanks for your answer!

_________________________________________________________
#include "mex.h"
#include <math.h>
#define PI 3.14159

void source (double x, double y, double z, double x1, double y1, double z1,
double x2, double y2, double z2, double x3, double y3, double
z3,
double x4, double y4, double z4, double *srcphi, double
*dblphi)
{

double eps = 1e-10;
double d12,d23,d34,d41;
double r1,r2,r3,r4;
double e1,e2,e3,e4;
double h1,h2,h3,h4;
double m12,m23,m34,m41;

x1=x1+1*eps;
x2=x2-1*eps;
x3=x3+2*eps;
x4=x4-2*eps;

z1=0;
z2=0;
z3=0;
z4=0;

d12 = sqrt(pow((x2-x1),2) + pow((y2-y1),2));
d23 = sqrt(pow((x3-x2),2) + pow((y3-y2),2));
d34 = sqrt(pow((x4-x3),2) + pow((y4-y3),2));
d41 = sqrt(pow((x1-x4),2) + pow((y1-y4),2));

r1 = sqrt(pow((x-x1),2) + pow((y-y1),2) + pow(z,2));
r2 = sqrt(pow((x-x2),2) + pow((y-y2),2) + pow(z,2));
r3 = sqrt(pow((x-x3),2) + pow((y-y3),2) + pow(z,2));
r4 = sqrt(pow((x-x4),2) + pow((y-y4),2) + pow(z,2));

e1 = pow((x-x1),2) + pow(z,2);
e2 = pow((x-x2),2) + pow(z,2);
e3 = pow((x-x3),2) + pow(z,2);
e4 = pow((x-x4),2) + pow(z,2);

h1 = (x-x1)*(y-y1);
h2 = (x-x2)*(y-y2);
h3 = (x-x3)*(y-y3);
h4 = (x-x4)*(y-y4);

m12 = (y2-y1)/(x2-x1);
m23 = (y3-y2)/(x3-x2);
m34 = (y4-y3)/(x4-x3);
m41 = (y1-y4)/(x1-x4);

*(srcphi) = -1.0/(4*PI)*(
(
(((x-x1)*(y2-y1)-(y-y1)*(x2-x1))/d12)*log((r1+r2+d12)/(r1+r2-d12)) +
(((x-x2)*(y3-y2)-(y-y2)*(x3-x2))/d23)*log((r2+r3+d23)/(r2+r3-d23)) +
(((x-x3)*(y4-y3)-(y-y3)*(x4-x3))/d34)*log((r3+r4+d34)/(r3+r4-d34)) +
(((x-x4)*(y1-y4)-(y-y4)*(x1-x4))/d41)*log((r4+r1+d41)/(r4+r1-d41))
)
+fabs(z)*(
atan((m12*e1-h1)/(z*r1)) - atan((m12*e2-h2)/(z*r2)) +
atan((m23*e2-h2)/(z*r2)) - atan((m23*e3-h3)/(z*r3)) +
atan((m34*e3-h3)/(z*r3)) - atan((m34*e4-h4)/(z*r4)) +
atan((m41*e4-h4)/(z*r4)) - atan((m41*e1-h1)/(z*r1))
)
);

*(dblphi) = -1.0/(4*PI)*(
atan((m12*e1-h1)/(z*r1)) - atan((m12*e2-h2)/(z*r2))
+ atan((m23*e2-h2)/(z*r2)) - atan((m23*e3-h3)/(z*r3))
+ atan((m34*e3-h3)/(z*r3)) - atan((m34*e4-h4)/(z*r4))
+ atan((m41*e4-h4)/(z*r4)) - atan((m41*e1-h1)/(z*r1)));

return;
}




void coefficientmatrix(int totpanelsf, int totpanelswake, double eps,
double *xcf, double *ycf, double *zcf,
double *x1f, double *y1f, double *z1f,
double *x2f, double *y2f, double *z2f,
double *x3f, double *y3f, double *z3f,
double *x4f, double *y4f, double *z4f,
double *xe1, double *ye1, double *ze1,
double *xe2, double *ye2, double *ze2,
double *nxf, double *nyf, double *nzf,
double *z1fqs, double *z2fqs, double *z3fqs, double
*z4fqs,
double *xcwake, double *ycwake, double *zcwake,
double *x1wake, double *y1wake, double *z1wake,
double *x2wake, double *y2wake, double *z2wake,
double *x3wake, double *y3wake, double *z3wake,
double *x4wake, double *y4wake, double *z4wake,
double *xe1wake, double *ye1wake, double *ze1wake,
double *xe2wake, double *ye2wake, double *ze2wake,
double *xe3wake, double *ye3wake, double *ze3wake,
double *z1wakeqs, double *z2wakeqs, double *z3wakeqs,
double *z4wakeqs,
double *A, double *S, double *E)
{
int i,j,k,count = 0,count2=0;
double xp, yp, zp;
double pcolloc[3], p1[3], p2[3], p3[3], p4[3];
double srcphi, dblphi;

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

xp = xcf-nxf*eps;
yp = ycf-nyf*eps;
zp = zcf-nzf*eps;

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

pcolloc[0] = xe1[j]*(xp-xcf[j])+ye1[j]*(yp-ycf[j])+ze1[j]*(zp-zcf[j]);
pcolloc[1] = xe2[j]*(xp-xcf[j])+ye2[j]*(yp-ycf[j])+ze2[j]*(zp-zcf[j]);
pcolloc[2] = nxf[j]*(xp-xcf[j])+nyf[j]*(yp-ycf[j])+nzf[j]*(zp-zcf[j]);

p1[0] =
xe1[j]*(x1f[j]-xcf[j])+ye1[j]*(y1f[j]-ycf[j])+ze1[j]*(z1fqs[j]-zcf[j]);
p1[1] =
xe2[j]*(x1f[j]-xcf[j])+ye2[j]*(y1f[j]-ycf[j])+ze2[j]*(z1fqs[j]-zcf[j]);
p1[2] =
nxf[j]*(x1f[j]-xcf[j])+nyf[j]*(y1f[j]-ycf[j])+nzf[j]*(z1fqs[j]-zcf[j]);

p2[0] =
xe1[j]*(x2f[j]-xcf[j])+ye1[j]*(y2f[j]-ycf[j])+ze1[j]*(z2fqs[j]-zcf[j]);
p2[1] =
xe2[j]*(x2f[j]-xcf[j])+ye2[j]*(y2f[j]-ycf[j])+ze2[j]*(z2fqs[j]-zcf[j]);
p2[2] =
nxf[j]*(x2f[j]-xcf[j])+nyf[j]*(y2f[j]-ycf[j])+nzf[j]*(z2fqs[j]-zcf[j]);

p3[0] =
xe1[j]*(x3f[j]-xcf[j])+ye1[j]*(y3f[j]-ycf[j])+ze1[j]*(z3fqs[j]-zcf[j]);
p3[1] =
xe2[j]*(x3f[j]-xcf[j])+ye2[j]*(y3f[j]-ycf[j])+ze2[j]*(z3fqs[j]-zcf[j]);
p3[2] =
nxf[j]*(x3f[j]-xcf[j])+nyf[j]*(y3f[j]-ycf[j])+nzf[j]*(z3fqs[j]-zcf[j]);

p4[0] =
xe1[j]*(x4f[j]-xcf[j])+ye1[j]*(y4f[j]-ycf[j])+ze1[j]*(z4fqs[j]-zcf[j]);
p4[1] =
xe2[j]*(x4f[j]-xcf[j])+ye2[j]*(y4f[j]-ycf[j])+ze2[j]*(z4fqs[j]-zcf[j]);
p4[2] =
nxf[j]*(x4f[j]-xcf[j])+nyf[j]*(y4f[j]-ycf[j])+nzf[j]*(z4fqs[j]-zcf[j]);

source(pcolloc[0],pcolloc[1],pcolloc[2],p1[0],p1[1],p1[2],
p2[0],p2[1],p2[2],p3[0],p3[1],p3[2],
p4[0],p4[1],p4[2],&srcphi, &dblphi);

*(S+count)= srcphi;
*(A+count)= dblphi;
count++;
}

for (k=0;k<totpanelswake;k++)
{

pcolloc[0] =
xe1wake[k]*(xp-xcwake[k])+ye1wake[k]*(yp-ycwake[k])+ze1wake[k]*(zp-zcwake[k]
);
pcolloc[1] =
xe2wake[k]*(xp-xcwake[k])+ye2wake[k]*(yp-ycwake[k])+ze2wake[k]*(zp-zcwake[k]
);
pcolloc[2] =
xe3wake[k]*(xp-xcwake[k])+ye3wake[k]*(yp-ycwake[k])+ze3wake[k]*(zp-zcwake[k]
);

p1[0] =
xe1wake[k]*(x1wake[k]-xcwake[k])+ye1wake[k]*(y1wake[k]-ycwake[k])+ze1wake[k]
*(z1wakeqs[k]-zcwake[k]);
p1[1] =
xe2wake[k]*(x1wake[k]-xcwake[k])+ye2wake[k]*(y1wake[k]-ycwake[k])+ze2wake[k]
*(z1wakeqs[k]-zcwake[k]);
p1[2] =
xe3wake[k]*(x1wake[k]-xcwake[k])+ye3wake[k]*(y1wake[k]-ycwake[k])+ze3wake[k]
*(z1wakeqs[k]-zcwake[k]);

p2[0] =
xe1wake[k]*(x2wake[k]-xcwake[k])+ye1wake[k]*(y2wake[k]-ycwake[k])+ze1wake[k]
*(z2wakeqs[k]-zcwake[k]);
p2[1] =
xe2wake[k]*(x2wake[k]-xcwake[k])+ye2wake[k]*(y2wake[k]-ycwake[k])+ze2wake[k]
*(z2wakeqs[k]-zcwake[k]);
p2[2] =
xe3wake[k]*(x2wake[k]-xcwake[k])+ye3wake[k]*(y2wake[k]-ycwake[k])+ze3wake[k]
*(z2wakeqs[k]-zcwake[k]);

p3[0] =
xe1wake[k]*(x3wake[k]-xcwake[k])+ye1wake[k]*(y3wake[k]-ycwake[k])+ze1wake[k]
*(z3wakeqs[k]-zcwake[k]);
p3[1] =
xe2wake[k]*(x3wake[k]-xcwake[k])+ye2wake[k]*(y3wake[k]-ycwake[k])+ze2wake[k]
*(z3wakeqs[k]-zcwake[k]);
p3[2] =
xe3wake[k]*(x3wake[k]-xcwake[k])+ye3wake[k]*(y3wake[k]-ycwake[k])+ze3wake[k]
*(z3wakeqs[k]-zcwake[k]);

p4[0] =
xe1wake[k]*(x4wake[k]-xcwake[k])+ye1wake[k]*(y4wake[k]-ycwake[k])+ze1wake[k]
*(z4wakeqs[k]-zcwake[k]);
p4[1] =
xe2wake[k]*(x4wake[k]-xcwake[k])+ye2wake[k]*(y4wake[k]-ycwake[k])+ze2wake[k]
*(z4wakeqs[k]-zcwake[k]);
p4[2] =
xe3wake[k]*(x4wake[k]-xcwake[k])+ye3wake[k]*(y4wake[k]-ycwake[k])+ze3wake[k]
*(z4wakeqs[k]-zcwake[k]);

source(pcolloc[0],pcolloc[1],pcolloc[2],p1[0],p1[1],p1[2],
p2[0],p2[1],p2[2],p3[0],p3[1],p3[2],
p4[0],p4[1],p4[2],&srcphi, &dblphi);

*(E+count2)= dblphi;
count2++;
}

}
return;
}



void mexFunction (int nlhs, mxArray *plhs[],
int nrhs, const mxArray *prhs[])
{

/* Input variables */

int totpanelsf, totpanelswake;
double eps;

double *xcf, *ycf, *zcf;
double *x1f, *y1f, *z1f;
double *x2f, *y2f, *z2f;
double *x3f, *y3f, *z3f;
double *x4f, *y4f, *z4f;
double *xe1, *ye1, *ze1;
double *xe2, *ye2, *ze2;
double *nxf, *nyf, *nzf;
double *z1fqs, *z2fqs, *z3fqs, *z4fqs;

double *xcwake, *ycwake, *zcwake;
double *x1wake, *y1wake, *z1wake;
double *x2wake, *y2wake, *z2wake;
double *x3wake, *y3wake, *z3wake;
double *x4wake, *y4wake, *z4wake;
double *xe1wake, *ye1wake, *ze1wake;
double *xe2wake, *ye2wake, *ze2wake;
double *xe3wake, *ye3wake, *ze3wake;
double *z1wakeqs, *z2wakeqs, *z3wakeqs, *z4wakeqs;

/* Output variables */

double *A, *S, *E;


/* Assign scalars to input */

totpanelsf = mxGetScalar(prhs[0]);
totpanelswake = mxGetScalar(prhs[1]);
eps = mxGetScalar(prhs[2]);

/* Assign pointers to input */

xcf = mxGetPr(prhs[3]);
ycf = mxGetPr(prhs[4]);
zcf = mxGetPr(prhs[5]);

x1f = mxGetPr(prhs[6]);
y1f = mxGetPr(prhs[7]);
z1f = mxGetPr(prhs[8]);

x2f = mxGetPr(prhs[9]);
y2f = mxGetPr(prhs[10]);
z2f = mxGetPr(prhs[11]);

x3f = mxGetPr(prhs[12]);
y3f = mxGetPr(prhs[13]);
z3f = mxGetPr(prhs[14]);

x4f = mxGetPr(prhs[15]);
y4f = mxGetPr(prhs[16]);
z4f = mxGetPr(prhs[17]);

xe1 = mxGetPr(prhs[18]);
ye1 = mxGetPr(prhs[19]);
ze1 = mxGetPr(prhs[20]);

xe2 = mxGetPr(prhs[21]);
ye2 = mxGetPr(prhs[22]);
ze2 = mxGetPr(prhs[23]);

nxf = mxGetPr(prhs[24]);
nyf = mxGetPr(prhs[25]);
nzf = mxGetPr(prhs[26]);

z1fqs = mxGetPr(prhs[27]);
z2fqs = mxGetPr(prhs[28]);
z3fqs = mxGetPr(prhs[29]);
z4fqs = mxGetPr(prhs[30]);

xcwake = mxGetPr(prhs[31]);
ycwake = mxGetPr(prhs[32]);
zcwake = mxGetPr(prhs[33]);

x1wake = mxGetPr(prhs[34]);
y1wake = mxGetPr(prhs[35]);
z1wake = mxGetPr(prhs[36]);

x2wake = mxGetPr(prhs[37]);
y2wake = mxGetPr(prhs[38]);
z2wake = mxGetPr(prhs[39]);

x3wake = mxGetPr(prhs[40]);
y3wake = mxGetPr(prhs[41]);
z3wake = mxGetPr(prhs[42]);

x4wake = mxGetPr(prhs[43]);
y4wake = mxGetPr(prhs[44]);
z4wake = mxGetPr(prhs[45]);

xe1wake = mxGetPr(prhs[46]);
ye1wake = mxGetPr(prhs[47]);
ze1wake = mxGetPr(prhs[48]);

xe2wake = mxGetPr(prhs[49]);
ye2wake = mxGetPr(prhs[50]);
ze2wake = mxGetPr(prhs[51]);

xe3wake = mxGetPr(prhs[52]);
ye3wake = mxGetPr(prhs[53]);
ze3wake = mxGetPr(prhs[54]);

z1wakeqs = mxGetPr(prhs[55]);
z2wakeqs = mxGetPr(prhs[56]);
z3wakeqs = mxGetPr(prhs[57]);
z4wakeqs = mxGetPr(prhs[58]);

/* Create Matrices for the outputs */

plhs[0] = mxCreateDoubleMatrix(totpanelsf,totpanelsf,mxREAL);
plhs[1] = mxCreateDoubleMatrix(totpanelsf,totpanelsf,mxREAL);
plhs[2] = mxCreateDoubleMatrix(totpanelsf,totpanelswake,mxREAL);


/* Assign pointers to output */

A = mxGetPr(plhs[0]);
S = mxGetPr(plhs[1]);
E = mxGetPr(plhs[2]);

/* Call the coefficient matrix C subroutine */

coefficientmatrix(totpanelsf,totpanelswake,eps,
xcf, ycf, zcf,
x1f, y1f, z1f,
x2f, y2f, z2f,
x3f, y3f, z3f,
x4f, y4f, z4f,
xe1, ye1, ze1,
xe2, ye2, ze2,
nxf, nyf, nzf,
z1fqs, z2fqs, z3fqs, z4fqs,
xcwake, ycwake, zcwake,
x1wake, y1wake, z1wake,
x2wake, y2wake, z2wake,
x3wake, y3wake, z3wake,
x4wake, y4wake, z4wake,
xe1wake, ye1wake, ze1wake,
xe2wake, ye2wake, ze2wake,
xe3wake, ye3wake, ze3wake,
z1wakeqs, z2wakeqs, z3wakeqs, z4wakeqs,
A, S, E);
return;
}
 
C

CBFalconer

Martijn said:
ok, here it comes again :). thanks for your answer!
Click to expand...
.... great big snip ...

Note the words compilable complete above. Non-standard include
files must be present, together with their associated source.
Your exercise in cutting it down to that in the first place will
often reveal the problem.

Without these rules the result is usually pure gibberish.

Oh yes - please do not toppost. I fixed this one.
 
R

Richard Heathfield

Martijn said:
I've included the full code below, but at places i've deleted declarations
of variables
where they are obvious replaced by ...

Thanks in advance,

Martijn




#include "mex.h"
Click to expand...

gcc -g -W -Wall -ansi -pedantic -o foo foo.c -lm
foo.c:1: mex.h: No such file or directory

That's going to be a problem for anyone trying to help you.

<snip>
 
M

Martijn van den Branden

Sorry guys. I understand it's no use without mex.h, except for those maybe
who use matlab and write mex (matlab executables) themselves, and have
it installed with their matlab product. I'm sure the people at mathworks
would
not like it if i distributed mex.h myself :).

Thanks for your time!
 
P

Peter Pichler

Martijn van den Branden said:
Sorry guys. I understand it's no use without mex.h, except for those maybe
who use matlab and write mex (matlab executables) themselves, and have
it installed with their matlab product. I'm sure the people at mathworks
would
not like it if i distributed mex.h myself :).
Click to expand...

I can see that you still ignore at least three independent requests not to
top post. Top posting is a sign of cluelesness at best, ignoring other
people's polite requests is downright rude.
Thanks for your time!
Click to expand...

For some reason, I have not yet seen my post from last night. In case it
does not make it into the wild, it was (other than mentioning quite a few
style issues) about the log() function. In C, log() is your high school
equivalent of ln. If you want decimal logarithms, use log10(). Dunno if this
is the source of your problem, your description was a bit vague.

Peter
 
M

Martijn van den Branden

Peter Pichler said:
I can see that you still ignore at least three independent requests not to
top post. Top posting is a sign of cluelesness at best, ignoring other
people's polite requests is downright rude.


For some reason, I have not yet seen my post from last night. In case it
does not make it into the wild, it was (other than mentioning quite a few
style issues) about the log() function. In C, log() is your high school
equivalent of ln. If you want decimal logarithms, use log10(). Dunno if this
is the source of your problem, your description was a bit vague.

Peter
Click to expand...

I intended to use log. Sorry, i didn't mean to be rude, i just never heard
of
'topposting' before, this is also my first post to a newsgroup, i thought it
had something to do with the code. I admit that is clueless. From now
on, i solemny swear, i will put into good practice all the advice you gave
me on posting ;)

Martijn
 
A

Alan Balmer

I'm sorry, but i must say your reaction is close to antisocial. like i said
in my first message, i've close to no experience writing in c and i would
be very grateful if someone could point out some erroneous c syntax
from looking at the code, if there should be any, i didn't mean to offend
anyone.
Click to expand...

If there are syntax errors in your code, your compiler should point
them out. Make sure you have its warning level set for maximum
sensitivity. If the compiler produces error messages which you don't
understand, post the messages and the offending lines.
I cut out some code because the first person to respond to my question
advised it.
AndI thought that if i'm lucky people that have experience writing mex files
might read my question and point me in some direction. I'm sure to them
mex.h is familiar, if still non-standard.
Click to expand...
Then you should ask in some forum where "mex files" are on-topic.
Surely there would be a better chance of finding "people that have
experience writing mex files" in such a forum.

When I search Google groups for "matlab", eight of the first ten
results are from a newsgroup called "comp.soft-sys.matlab". I would
suggest that this is a better place to start. Now, couldn't you have
found that out yourself?
 

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