hist with nan's

[Muhali]

For hist (Y, X, NORM), octave normalizes relative to the number of rows in Y.
Since hist understands nan's, it would be more logical so normalize relative
to the non-nan's of Y. The appropriate patch is attached.

M.

--- hist.m      2012-05-09 11:11:55.840231862 -0700
+++ /tmp/hist.m 2012-05-09 11:11:25.924878643 -0700
@@ -149,7 +149,8 @@
   if (nargin > 2 && ! ischar (varargin{iarg}))
     ## Normalise the histogram.
     norm = varargin{iarg++};
-    freq = freq / rows (y) * norm;
+    # freq = freq / rows (y) * norm;
+    freq = freq / sum (!isnan(y)) * norm;
   endif
 
   if (nargout > 0)


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