maint: Clean up m-files to follow Octave coding conventions. Try to trim long lines to < 80 chars. Use '##' for single line comments. Use '(...)' around tests for if/elseif/switch/while. Abut cell indexing operator '{' next to variable. Abut array indexing operator '(' next to variable. Use space between negation operator '!' and following expression. Use two newlines between endfunction and start of %!test or %!demo code. Remove unnecessary parens grouping between short-circuit operators. Remove stray extra spaces (typos) between variables and assignment operators. Remove stray extra spaces from ends of lines.

--- a/scripts/statistics/distributions/empirical_rnd.m
+++ b/scripts/statistics/distributions/empirical_rnd.m
@@ -57,13 +57,12 @@
 %!assert (size (empirical_rnd (1:2, [4 1])), [4, 1])
 %!assert (size (empirical_rnd (1:2, 4, 1)), [4, 1])
 
-%% Test class of input preserved
+## Test class of input preserved
 %!assert (class (empirical_rnd (1:2, 1)), "double")
 %!assert (class (empirical_rnd (single (1:2), 1)), "single")
 
-%% Test input validation
+## Test input validation
 %!error empirical_rnd ()
 %!error empirical_rnd (ones (2), 1)
-%% test data verification
 %!error empirical_rnd (ones (2), 1, 1)