file_size: more efficient

Author: scivision

+stdlib/file_size.m

@@ -14,7 +14,13 @@
 
 i = isfile(p);
 
-d = arrayfun(@dir, p(i));
+if ~any(i)
+  return
+elseif isscalar(p)
+  d = dir(p);
+else
+  d = arrayfun(@dir, p(i));
+end
 
 i = i & ~isempty(d);
 s(i) = [d.bytes];

example/bench_file_size.m

@@ -2,8 +2,8 @@
 
 f = mfilename("fullpath") + ".m";
 
-fno = @() stdlib.file_size(f, false);
+fno = @() stdlib.file_size(f);
 
 t_no = timeit(fno);
 
-disp("No Java: " + t_no + " s")
+disp(t_no + " s")