/*
- * Principal component analysis
+ * principal component analysis (PCA)
* Copyright (c) 2004 Michael Niedermayer <michaelni@gmx.at>
*
* This file is part of FFmpeg.
*/
/**
- * @file pca.c
- * Principal component analysis
+ * @file libavutil/pca.c
+ * principal component analysis (PCA)
*/
#include "common.h"
if(pass < 3 && fabs(covar) < sum / (5*n*n)) //FIXME why pass < 3
continue;
- if(fabs(covar) == 0.0) //FIXME shouldnt be needed
+ if(fabs(covar) == 0.0) //FIXME should not be needed
continue;
if(pass >=3 && fabs((eigenvalue[j]+z[j])/covar) > (1LL<<32) && fabs((eigenvalue[i]+z[i])/covar) > (1LL<<32)){
pca->covariance[j + i*n]=0.0;
#ifdef TEST
#undef printf
-#undef random
#include <stdio.h>
#include <stdlib.h>
+#include "lfg.h"
-int main(){
+int main(void){
PCA *pca;
int i, j, k;
#define LEN 8
double eigenvector[LEN*LEN];
double eigenvalue[LEN];
+ AVLFG prng;
+
+ av_lfg_init(&prng, 1);
pca= ff_pca_init(LEN);
for(i=0; i<9000000; i++){
double v[2*LEN+100];
double sum=0;
- int pos= random()%LEN;
- int v2= (random()%101) - 50;
- v[0]= (random()%101) - 50;
+ int pos = av_lfg_get(&prng) % LEN;
+ int v2 = av_lfg_get(&prng) % 101 - 50;
+ v[0] = av_lfg_get(&prng) % 101 - 50;
for(j=1; j<8; j++){
if(j<=pos) v[j]= v[0];
else v[j]= v2;
/* for(j=0; j<LEN; j++){
v[j] -= v[pos];
}*/
-// sum += random()%10;
+// sum += av_lfg_get(&prng) % 10;
/* for(j=0; j<LEN; j++){
v[j] -= sum/LEN;
}*/