Fix flip error, fix chunksize

tofil.py

@@ -41,7 +41,8 @@ def create_filterbank(infile, outfile=None, date=None, source=None):
     else:
         date = Time(date, format='isot')
 
-    print("Creating filterbank file {} from {}".format(outfile, infile))
+    print("Input file: {}".format(infile))
+    print("Output file: {}".format(outfile))
     print("Source name: {}".format(source))
     print("Observation time: {}".format(date.isot))
 
@@ -77,21 +78,25 @@ def create_filterbank(infile, outfile=None, date=None, source=None):
     filesize = os.stat(infile).st_size
     print("File size:", filesize)
     offset = 0
-    while offset < filesize and False:
+    CHUNKSIZE = 10000
+    while offset < filesize:
         # Loop through file in chunks of 256*10000 numbers
-        # i.e. 256*10000*4 bytes (10Mb) to avoid memory problems
+        # i.e. 256*CHUNKSIZE*4 bytes (10Mb) to avoid memory problems
         f.seek(offset, os.SEEK_SET)
 
-        data = np.fromfile(f, dtype='>u4', count=256*100000).reshape(-1,256)
+        data = np.fliplr(np.fromfile(f, dtype='>u4', count=256*CHUNKSIZE).reshape(-1,256))
 
         # Check that no packets were dropped
-        if np.sum(data[1:,0]-data[:-1,0]-1) > 0.1:
-            print("Packets were dropped:", np.count_nonzero(data[:-1,0]-data[1:,0]-1), np.sum(data[1:,0]-data[:-1,0]-1))
+        if np.sum(data[1:,-1] - data[:-1,-1] - 1) > 0.1:
+            print("Packets were dropped:", np.count_nonzero(data[:-1,-1] - data[1:,-1] - 1),
+                                           np.sum(data[1:,-1] - data[:-1,-1] - 1))
 
+        print("Offset: {}".format(offset))
+        print("Size:   {}".format(os.stat(outfile).st_size))
         # Write data
         out.append_spectra(data)
 
-        offset += 256*10000*4
+        offset += 256*CHUNKSIZE*4
 
     # Close file
     out.close()