Woops, one should not test with input of all zeros

test/rand_fft_data.py

@@ -0,0 +1,26 @@
+#!/usr/local/bin/python2.3
+
+import sys
+import random
+import struct
+
+def main():
+    from getopt import getopt
+    opts,args = getopt(sys.argv[1:],'n:N:t:l:h:')
+    opts=dict(opts)
+    nbufs = int( opts.get('-n','10000') )
+    nfft = int( opts.get('-N','1024') )
+    type = opts.get('-t','f')
+    lo = float(opts.get('-l','-32768') )
+    hi = float(opts.get('-h','32767') )
+
+    format = {'float':'f','short':'h','double':'d'}[type]
+
+    nums = [ random.uniform(lo,hi) for i in range(nfft*2) ]
+    buf = struct.pack( '%d%s' % ( len( nums ) , format ) , *nums )
+
+    for i in range(nbufs):
+        sys.stdout.write( buf )
+
+if __name__ == '__main__':
+    main()