Use common code idiom for checking whether a double value is an integer. * num2str.m, rotdim.m, get_first_help_sentence.m, ind2rgb.m, commutation_matrix.m, figure.m, legend.m, polyfit.m, bartlett.m, blackman.m, detrend.m, hamming.m, hanning.m, factorial.m, mode.m, skewness.m, statistics.m, mcnemar_test.m: Use idiom 'x == fix (x)' to test for integerness.

--- a/scripts/specfun/factorial.m
+++ b/scripts/specfun/factorial.m
@@ -29,7 +29,7 @@
 function x = factorial (n)
   if (nargin != 1)
     print_usage ();
-  elseif (any (n(:) < 0 | n(:) != round (n(:))))
+  elseif (any (n(:) < 0 | n(:) != fix (n(:))))
     error ("factorial: N must all be nonnegative integers");
   endif
   x = round (gamma (n+1));