2016 Update

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

@@ -1,15 +1,16 @@
-    % Is string numeric?
-    function out = is_str_numeric(s)
-        out = ~isempty(parse_float(s));
-    end
+    % copy from Octave version on this page
+    function r = isnum(a)
+     if ( isnumeric(a) )
+       r = 1;
+     else
+       o = str2num(a);
+       r = !isempty(o);
+     endif
+   end
 
-    % 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
+% tests
+disp(isnum(123)) % 1
+disp(isnum("123")) % 1
+disp(isnum("foo123")) % 0
+disp(isnum("123bar")) % 0
+disp(isnum("3.1415")) % 1