Overhaul of statistical distribution functions Support class "single" 75% reduction in memory usage More Matlab compatibility for corner cases * betacdf.m, betainv.m, betapdf.m, betarnd.m, binocdf.m, binoinv.m, binopdf.m, binornd.m, cauchy_cdf.m, cauchy_inv.m, cauchy_pdf.m, cauchy_rnd.m, chi2cdf.m, chi2inv.m, chi2pdf.m, chi2rnd.m, discrete_cdf.m, discrete_inv.m, discrete_pdf.m, discrete_rnd.m, empirical_cdf.m, empirical_inv.m, empirical_pdf.m, empirical_rnd.m, expcdf.m, expinv.m, exppdf.m, exprnd.m, fcdf.m, finv.m, fpdf.m, frnd.m, gamcdf.m, gaminv.m, gampdf.m, gamrnd.m, geocdf.m, geoinv.m, geopdf.m, geornd.m, hygecdf.m, hygeinv.m, hygepdf.m, hygernd.m, kolmogorov_smirnov_cdf.m, laplace_cdf.m, laplace_inv.m, laplace_pdf.m, laplace_rnd.m, logistic_cdf.m, logistic_inv.m, logistic_pdf.m, logistic_rnd.m, logncdf.m, logninv.m, lognpdf.m, lognrnd.m, nbincdf.m, nbininv.m, nbinpdf.m, nbinrnd.m, normcdf.m, norminv.m, normpdf.m, normrnd.m, poisscdf.m, poissinv.m, poisspdf.m, poissrnd.m, stdnormal_cdf.m, stdnormal_inv.m, stdnormal_pdf.m, stdnormal_rnd.m, tcdf.m, tinv.m, tpdf.m, trnd.m, unidcdf.m, unidinv.m, unidpdf.m, unidrnd.m, unifcdf.m, unifinv.m, unifpdf.m, unifrnd.m, wblcdf.m, wblinv.m, wblpdf.m, wblrnd.m: Return "single" outputs for "single" inputs, Use logical indexing rather than find() for 75% memory savings, Add tests for all functions, Use consistent documentation across all functions, More Matlab compatibilitcy for corner cases.

--- a/scripts/statistics/distributions/stdnormal_cdf.m
+++ b/scripts/statistics/distributions/stdnormal_cdf.m
@@ -1,3 +1,4 @@
+## Copyright (C) 2011 Rik Wehbring
 ## Copyright (C) 1995-2011 Kurt Hornik
 ##
 ## This file is part of Octave.
@@ -18,8 +19,9 @@
 
 ## -*- texinfo -*-
 ## @deftypefn {Function File} {} stdnormal_cdf (@var{x})
-## For each component of @var{x}, compute the CDF of the standard normal
-## distribution at @var{x}.
+## For each element of @var{x}, compute the cumulative distribution
+## function (CDF) at @var{x} of the standard normal distribution
+## (mean = 0, standard deviation = 1).
 ## @end deftypefn
 
 ## Author: KH <Kurt.Hornik@wu-wien.ac.at>
@@ -31,9 +33,8 @@
     print_usage ();
   endif
 
-  sz = size (x);
-  if (numel(x) == 0)
-    error ("stdnormal_cdf: X must not be empty");
+  if (iscomplex (x))
+    error ("stdnormal_cdf: X must not be complex");
   endif
 
   cdf = erfc (x / (-sqrt(2))) / 2;
@@ -41,5 +42,16 @@
 endfunction
 
 
+%!shared x,y
+%! x = [-Inf 0 1 Inf];
+%! y = [0, 0.5, 1/2*(1+erf(1/sqrt(2))), 1];
+%!assert(stdnormal_cdf ([x, NaN]), [y, NaN]);
 
+%% Test class of input preserved
+%!assert(stdnormal_cdf (single([x, NaN])), single([y, NaN]), eps("single"));
 
+%% Test input validation
+%!error stdnormal_cdf ()
+%!error stdnormal_cdf (1,2)
+%!error stdnormal_cdf (i)
+