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changeset 12749:e7cc2d4a6db3 stable

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Fix range of sigma in normal distribution to exclude 0. * normcdf.m, normpdf.m: Correct 's >= 0' to 's > 0'.
author Rik <octave@nomad.inbox5.com>
date Thu, 16 Jun 2011 21:05:10 -0700
parents 901d466ee55a
children 89d41b6aa661
files scripts/statistics/distributions/normcdf.m scripts/statistics/distributions/normpdf.m
diffstat 2 files changed, 6 insertions(+), 6 deletions(-) [+]
line wrap: on
line diff
--- a/scripts/statistics/distributions/normcdf.m
+++ b/scripts/statistics/distributions/normcdf.m
@@ -50,18 +50,18 @@
   cdf = zeros (sz);
 
   if (isscalar (m) && isscalar(s))
-    if (find (isinf (m) | isnan (m) | !(s >= 0) | !(s < Inf)))
+    if (find (isinf (m) | isnan (m) | !(s > 0) | !(s < Inf)))
       cdf = NaN (sz);
     else
       cdf =  stdnormal_cdf ((x - m) ./ s);
     endif
   else
-    k = find (isinf (m) | isnan (m) | !(s >= 0) | !(s < Inf));
+    k = find (isinf (m) | isnan (m) | !(s > 0) | !(s < Inf));
     if (any (k))
       cdf(k) = NaN;
     endif
 
-    k = find (!isinf (m) & !isnan (m) & (s >= 0) & (s < Inf));
+    k = find (!isinf (m) & !isnan (m) & (s > 0) & (s < Inf));
     if (any (k))
       cdf(k) = stdnormal_cdf ((x(k) - m(k)) ./ s(k));
     endif
--- a/scripts/statistics/distributions/normpdf.m
+++ b/scripts/statistics/distributions/normpdf.m
@@ -50,18 +50,18 @@
   pdf = zeros (sz);
 
   if (isscalar (m) && isscalar (s))
-    if (find (isinf (m) | isnan (m) | !(s >= 0) | !(s < Inf)))
+    if (find (isinf (m) | isnan (m) | !(s > 0) | !(s < Inf)))
       pdf = NaN (sz);
     else
       pdf = stdnormal_pdf ((x - m) ./ s) ./ s;
     endif
   else
-    k = find (isinf (m) | isnan (m) | !(s >= 0) | !(s < Inf));
+    k = find (isinf (m) | isnan (m) | !(s > 0) | !(s < Inf));
     if (any (k))
       pdf(k) = NaN;
     endif
 
-    k = find (!isinf (m) & !isnan (m) & (s >= 0) & (s < Inf));
+    k = find (!isinf (m) & !isnan (m) & (s > 0) & (s < Inf));
     if (any (k))
       pdf(k) = stdnormal_pdf ((x(k) - m(k)) ./ s(k)) ./ s(k);
     endif