[manual] help and error string corrected in hist.m

[Francesco Potortì]

# HG changeset patch
# User Francesco Potortì <pot at gnu.org>
# Date 1230326187 -3600
# Node ID d1d1faefe0ae0cbf49be44819c85f9d8f161441d
# Parent  60107c9637c2e4f9c44111d60dcc7c54daedf4bf
help and error string corrected in hist.m.

diff -r 60107c9637c2 -r d1d1faefe0ae scripts/ChangeLog
--- a/scripts/ChangeLog	Fri Dec 26 20:33:52 2008 +0100
+++ b/scripts/ChangeLog	Fri Dec 26 22:16:27 2008 +0100
@@ -1,3 +1,8 @@ 2008-12-24  Doug Stewart  <dastew at sympat
+2008-12-26  Francesco Potortì  <pot at gnu.org>
+
+	* plot/hist.m: Doc string now mentions matrix input argument.
+	Correct error message.
+
 2008-12-24  Doug Stewart  <dastew at sympatico.ca>
 
 	* plot/grid.m: Handle "minor" option.
diff -r 60107c9637c2 -r d1d1faefe0ae scripts/plot/hist.m
--- a/scripts/plot/hist.m	Fri Dec 26 20:33:52 2008 +0100
+++ b/scripts/plot/hist.m	Fri Dec 26 22:16:27 2008 +0100
@@ -23,7 +23,8 @@
 ##
 ## With one vector input argument, plot a histogram of the values with
 ## 10 bins.  The range of the histogram bins is determined by the range
-## of the data.
+## of the data.  With one matrix input argument, plot a hystogram where
+## each bin contains a bar per input column.
 ##
 ## Given a second scalar argument, use that as the number of bins.
 ##
@@ -59,7 +60,7 @@ function [nn, xx] = hist (y, varargin)
     max_val = max (y(:));
     min_val = min (y(:));
   else
-    error ("hist: first argument must be a vector");
+    error ("hist: first argument must be real valued");
   endif
 
   iarg = 1;

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