Time for an 2014 update…

Task/Determine-if-a-string-is-numeric/MATLAB/determine-if-a-string-is-numeric.m

@@ -1,20 +1,15 @@
-% Is string numeric?
-
-function [out] = str_isnumeric(string)
-
-    if ~ischar(string)
-        error('str_isnumeric:NonCharacterArray','not a string input');
+    % Is string numeric?
+    function out = is_str_numeric(s)
+        out = ~isempty(parse_float(s));
     end
 
-    Nd = sum(isstrprop(string,'digit'));
-    Nc = length(string);
-
-    dN = Nc - Nd;
-
-    switch dN
-        case 0
-            out = 1;
-        otherwise
-            out = 0;
+    % Returns the float (double) if true, empty array otherwise.
+    function f = parse_float(s)
+        [f_in_cell, pos] = textscan(s, '%f');
+        % Make sure there are no trailing chars. textscan(..) is greedy.
+        if pos == length(s)
+            f = f_in_cell{:};
+        else
+            f = [];
+        end
     end
-end