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changeset 12482:3244c6e0af4a

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polynomial/polyval.m: Compute offset/normalization only when needed.
author Ben Abbott <bpabbott@mac.com>
date Sat, 26 Feb 2011 16:21:02 -0500
parents 97d103fcb6dd
children 7a5aacf65f81
files scripts/ChangeLog scripts/polynomial/polyval.m
diffstat 2 files changed, 6 insertions(+), 3 deletions(-) [+]
line wrap: on
line diff
--- a/scripts/ChangeLog
+++ b/scripts/ChangeLog
@@ -1,3 +1,7 @@
+2011-02-26  Robert T. Short  <octave@phaselockedsystems.com>
+
+	* polynomial/polyval.m: Compute offset/normalization only when needed.
+
 2011-02-26  Robert T. Short <octave@phaselockedsystems.com>
 
 	* polynomial/polyval.m: Minor simplification in polynomial evaluation.
--- a/scripts/polynomial/polyval.m
+++ b/scripts/polynomial/polyval.m
@@ -53,8 +53,8 @@
     error ("polyval: first argument must be a vector");
   endif
 
-  if (nargin < 4)
-    mu = [0, 1];
+  if (nargin > 3)
+    x = (x - mu(1)) / mu(2);
   endif
 
   if (isempty (x))
@@ -68,7 +68,6 @@
   endif
 
   n = length (p) - 1;
-  x = (x - mu(1)) / mu(2);
   y = p(1) * ones (size (x));
   for i = 2:n+1
     y = y .* x + p(i);