public double Evaluate( IChromosome chromosome )
{
// get function in polish notation
string function = chromosome.ToString( );
// go through all the data
double error = 0.0;
for ( int i = 0, n = data.GetLength( 0 ); i < n; i++ )
{
// put next X value to variables list
variables[0] = data[i, 0];
// avoid evaluation errors
try
{
// evalue the function
double y = PolishExpression.Evaluate( function, variables );
// check for correct numeric value
if ( double.IsNaN( y ) )
return 0;
// get the difference between evaluated Y and real Y
// and sum error
error += Math.Abs( y - data[i, 1] );
}
catch
{
return 0;
}
}
// return optimization function value
return 100.0 / ( error + 1 );
}
