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/optimization/lsqnonneg.m	Mon Feb 23 16:42:25 2015 +0000
+++ b/scripts/optimization/lsqnonneg.m	Mon Feb 23 14:54:39 2015 -0800
@@ -82,7 +82,8 @@
     return;
   endif
 
-  if (! (nargin >= 2 && nargin <= 4 && ismatrix (c) && ismatrix (d) && isstruct (options)))
+  if (nargin < 2 || nargin > 4
+      || ! (ismatrix (c) && ismatrix (d) && isstruct (options)))
     print_usage ();
   endif