MATLAB to JSON bug - now handles Inf and NaN

Author: chriddyp

plotly/plotly_aux/m2json.m

@@ -28,8 +28,10 @@
         else
             valstr = 'false';
         end
+    elseif isinf(val)
+        valstr = 'null'
+    elseif isnan(val)
+        valstr = 'null'
     else
         valstr = ''; % wtf is it?
-    end   
-    valstr = strrep(valstr, 'Inf', 'null');
-    valstr = strrep(valstr, 'NaN', 'null');
+    end