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/sparse/sprandsym.m
+++ b/scripts/sparse/sprandsym.m
@@ -159,14 +159,14 @@
 %! assert (size (s), [10, 10]);
 %! assert (nnz (s) / numel (s), 0.1, .01);
 
-%% Test 1-input calling form
+## Test 1-input calling form
 %!test
 %! s = sprandsym (sparse ([1 2 3], [3 2 3], [2 2 2]));
 %! [i, j] = find (s);
 %! assert (sort (i), [2 3]');
 %! assert (sort (j), [2 3]');
 
-%% Test input validation
+## Test input validation
 %!error sprandsym ()
 %!error sprandsym (1, 2, 3)
 %!error sprandsym (ones (3), 0.5)