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In the latest build 419, we have included a new mode of 3D visualization of testing results.

Here is a quick video showing how the tester works:

To play it, set "Math calculations" mode to prevent transmission of historical data, and start testing of the following Expert Advisor with limits -3.00 to 3.00 and step equal to 0.025:

#property copyright "Copyright 2011, MetaQuotes Software Corp."
#property link      "http://www.mql5.com"
#property version   "1.00"
//--- input parameters
input double   x=-3.0;
input double   y=-3.0;
//+------------------------------------------------------------------+
//| Tester function                                                  |
//+------------------------------------------------------------------+
double OnTester()
  {
//---
   double res=MathExp(-x*x-y*y);
//---
   return(res);
  }

Here are some variants of visualization of mathematical calculations (MQ5 files):