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| #include "curvelet3d_ridgeletbased.h"
void quicksort(unsigned long n, float arr[]){
unsigned long i,ir=n,j,k,l=1,*istack;
int jstack=0;
float a,temp;
istack=lvector(1,NSTACK);
for (;;) {
if (ir-l < M) {
for (j=l+1;j<=ir;j++) {
a=arr[j];
for (i=j-1;i>=l;i--) {
if (arr[i] <= a) break;
arr[i+1]=arr[i];
}
arr[i+1]=a;
}
if (jstack == 0) break;
ir=istack[jstack--];
l=istack[jstack--];
} else {
k=(l+ir) >> 1;
SWAP(arr[k],arr[l+1])
if (arr[l] > arr[ir]) {
SWAP(arr[l],arr[ir])
}
if (arr[l+1] > arr[ir]) {
SWAP(arr[l+1],arr[ir])
}
if (arr[l] > arr[l+1]) {
SWAP(arr[l],arr[l+1])
}
i=l+1;
j=ir;
a=arr[l+1];
for (;;) {
do i++; while (arr[i] < a);
do j--; while (arr[j] > a);
if (j < i) break;
SWAP(arr[i],arr[j]);
}
arr[l+1]=arr[j];
arr[j]=a;
jstack += 2;
if (jstack > NSTACK) nrerror("NSTACK too small in sort.");
if (ir-i+1 >= j-l) {
istack[jstack]=ir;
istack[jstack-1]=i;
ir=j-1;
} else {
istack[jstack]=j-1;
istack[jstack-1]=l;
l=i;
}
}
}
free_lvector(istack,1,NSTACK);
} |
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