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created by

anonymous

1 minute ago

​x
 
#include <math.h>
#define particlenumber 334
​
int Px[334], Py[334], U[334], ux[334][334], V[334], uy[334][334];
​
void intrapolation_velocity()
{
int i;
int node1x[particlenumber], node1y[particlenumber], node2x[particlenumber], node2y[particlenumber],node3x[particlenumber], node3y[particlenumber],node4x[particlenumber], node4y[particlenumber];
double w1,w2,w3,w4;
for (i = 0; i<particlenumber; i++) 
{
node1x[i]=trunc(Px[i]);
node1y[i]=trunc(Py[i]);
node2x[i]=node1x[i];
node2y[i]=node1y[i]+1;
node3x[i]=node1x[i]+1;
node3y[i]=node1y[i]+1;
node4x[i]=node1x[i]+1;
node4y[i]=node1y[i];
w1=sqrt((Px[i]-node1x[i])*(Px[i]-node1x[i])+(Py[i]-node1y[i])*(Py[i]-node1y[i]));
w2=sqrt((Px[i]-node2x[i])*(Px[i]-node2x[i])+(Py[i]-node2y[i])*(Py[i]-node2y[i]));
w3=sqrt((Px[i]-node3x[i])*(Px[i]-node3x[i])+(Py[i]-node3y[i])*(Py[i]-node3y[i]));
w4=sqrt((Px[i]-node4x[i])*(Px[i]-node4x[i])+(Py[i]-node4y[i])*(Py[i]-node4y[i]));
U[i]=w1*ux[node1x[i]][node1y[i]]+w2*ux[node2x[i]][node2y[i]]+w3*ux[node3x[i]][node3y[i]]+w4*ux[node4x[i]][node4y[i]];
U[i]=U[i]/(w1+w2+w3+w4);
V[i]=w1*uy[node1x[i]][node1y[i]]+w2*uy[node2x[i]][node2y[i]]+w3*uy[node3x[i]][node3y[i]]+w4*uy[node4x[i]][node4y[i]];
V[i]=V[i]/(w1+w2+w3+w4);
​
}
return ; 
}

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/usr/lib/x86_64-linux-gnu/crt1.o: In function `_start':
(.text+0x20): undefined reference to `main'
/tmp/cc6zJXG5.o: In function `intrapolation_velocity':
prog.c:(.text+0x188): undefined reference to `sqrt'
prog.c:(.text+0x222): undefined reference to `sqrt'
prog.c:(.text+0x2bc): undefined reference to `sqrt'
prog.c:(.text+0x356): undefined reference to `sqrt'
collect2: error: ld returned 1 exit status

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