X-Git-Url: https://hackdaworld.org/gitweb/?a=blobdiff_plain;f=fourier%2Ffourier.c;h=89f42c24ce8b132c9d22cbb23646dad95eeac827;hb=HEAD;hp=4f395f5f53d242f841f3f1c620ebcc6fa7ce88db;hpb=515c7fc6da820714686f9bfc87ccb9743c57d692;p=my-code%2Fapi.git

diff --git a/fourier/fourier.c b/fourier/fourier.c
index 4f395f5..89f42c2 100644
--- a/fourier/fourier.c
+++ b/fourier/fourier.c
@@ -183,25 +183,23 @@ int fourier_dft_2d(t_fourier *fourier) {
   if(fourier->type&BWD) return F_NOT_SUPPORTED;
 
   /* stupid way */
- 
-  // for(v=0;v<Y;v++) {
-  //   off_f=v*X;
-  //   for(u=0;u<X;u++) {
-  //     dprintf(fourier->outfd,"[fourier] (u=%d,v=%d)\n",u,v);
-  //     fourier->ftdata[off_f+u].r=0;
-  //     fourier->ftdata[off_f+u].i=0;
-  //     for(y=0;y<Y;y++) {
-  //       off_r=y*X;
-  //       for(x=0;x<X;x++) {
-  //        arg=-2.0*M_PI*((1.0*u*x)/X+(1.0*v*y)/Y);
-  //         fourier->ftdata[off_f+u].r+=(cos(arg)*fourier->data[off_r+x].r-sin(arg)*fourier->data[off_r+x].i);
-  //         fourier->ftdata[off_f+u].i+=(sin(arg)*fourier->data[off_r+x].r+cos(arg)*fourier->data[off_r+x].i);
-  //       }
-  //     }
-  //     fourier->ftdata[off_f+u].r/=(X*Y);
-  //     fourier->ftdata[off_f+u].i/=(X*Y);
-  //   }
-  // }
+  /*
+  for(v=0;v<Y;v++) {
+    off_f=v*X;
+    for(u=0;u<X;u++) {
+      for(y=0;y<Y;y++) {
+        off_r=y*X;
+        for(x=0;x<X;x++) {
+         arg=-2.0*M_PI*((1.0*u*x)/X+(1.0*v*y)/Y);
+          fourier->ftdata[off_f+u].r+=(cos(arg)*fourier->data[off_r+x].r-sin(arg)*fourier->data[off_r+x].i);
+          fourier->ftdata[off_f+u].i+=(sin(arg)*fourier->data[off_r+x].r+cos(arg)*fourier->data[off_r+x].i);
+        }
+      }
+      fourier->ftdata[off_f+u].r/=(X*Y);
+      fourier->ftdata[off_f+u].i/=(X*Y);
+    }
+  }
+  */
 
   /* the more clever way ... */
   // dft on index 1
@@ -221,22 +219,23 @@ int fourier_dft_2d(t_fourier *fourier) {
     off_f+=X;
   }
   //  dft on index 2 of 'index 1 transformed data'
-  off_f=0;
   for(x=0;x<X;x++) {
+    off_f=x;
     for(v=0;v<Y;v++) {
       //dprintf(fourier->outfd,"[fourier] (u=%d,v=%d)\n",v,x);
+      off_r=x;
       for(y=0;y<Y;y++) {
         arg=-2.0*M_PI*v*y/Y;
-        off_r=off_f+y;
-        fourier->ftdata[off_f+v].r+=(cos(arg)*data[off_r].r-sin(arg)*data[off_r].i);
-        fourier->ftdata[off_f+v].r+=(sin(arg)*data[off_r].r+cos(arg)*data[off_r].i);
+        fourier->ftdata[off_f].r+=(cos(arg)*data[off_r].r-sin(arg)*data[off_r].i);
+        fourier->ftdata[off_f].r+=(sin(arg)*data[off_r].r+cos(arg)*data[off_r].i);
+        off_r+=X;
       }
-      fourier->ftdata[off_f+v].r/=Y;
-      fourier->ftdata[off_f+v].i/=Y;
+      fourier->ftdata[off_f].r/=Y;
+      fourier->ftdata[off_f].i/=Y;
+      off_f+=X;
     }
-    off_f+=Y;
   }
-
+ 
   free(data);
 
   return F_SUCCESS;