HISTOGRAMS: Fix bin width problems on large numbers of bins

[pspp] / src / math / histogram.h

diff --git a/src/math/histogram.h b/src/math/histogram.h
index f03e767c5eec3cdc72e0d284b805689e4885eb5d..3f8fc3e7e75abdba3fb0fbbfb72ac769939c43b2 100644 (file)
--- a/src/math/histogram.h
+++ b/src/math/histogram.h
@@ -30,7 +30,13 @@ struct histogram
   gsl_histogram *gsl_hist;
 };
 
-struct histogram * histogram_create (double bin_width, double max, double min);
+/* 
+   Prepare a histogram for data which lies in the range [min, max)
+   bin_width is a nominal figure only.  It is a hint about what might be
+   an good approximate bin width, but the implementation will adjust it
+   as it thinks fit.
+ */
+struct histogram * histogram_create (double bin_width, double min, double max);
 
 void histogram_add (struct histogram *h, double y, double c);