--------------------------------

Rastrigin function:  f(X,Y) = X^2 - a . cos(2*PI*X) + Y^2 - a . cos(2*PI*Y) + 2*a

	double result = 0;
	double a = 10;
	for (int i = 0; i < t.parameters.length; i++) {
	    double v = t.parameters[i];
	    result += v * v - a * Math.cos(2 * Math.PI * v);
	}    
	result += a *  t.parameters.length;
	return result;

--------------------------------

Schwefel function:   f(x) = V*n + Sum(i=1,n) { -x_i*sin(sqrt(abs(x_i))) } 

	double result = 0;
	for (int i = 0; i <  t.parameters.length; i++) {
	    double v =  t.parameters[i];
	    result += -v * Math.sin(Math.sqrt(Math.abs(v)));
	}    
	result += 418.9829 * t.parameters.length;
	return result;

--------------------------------

Rosenbrock function:   f(x) = \sum_{i=1}^{n-1}(100\cdot(x_{i+1}-x_i)^2 + (1-x_i)^2)

	double result = 0;
	for (int i = 0; i < t.parameters.length - 1; i++) {
	    double v = t.parameters[i+1] - t.parameters[i];
	    result += 100*v*v;
	    v = 1 - t.parameters[i];
	    result += v*v;
	}    
	return result;

--------------------------------

// Griewangk's Function

	double result = 1;
	double product = 1;
	for (int i = 0; i < t.parameters.length; i++) {
	    double v = t.parameters[i];
	    result += v * v / 4000;
	    product *= Math.cos(v/Math.sqrt(i+1));
	}    
	result -= product;
	return result;

--------------------------------

// Ackley Function

	double squareSum = 0, cosSum = 0;
	for (int i = 0; i < t.parameters.length; i++) {
	    double v = t.parameters[i];
	    squareSum += v * v;
	    cosSum += Math.cos(2*Math.PI*v);
	}    
	double result = 20 + Math.E 
	    - 20*Math.exp(-0.2*Math.sqrt(squareSum/t.parameters.length)) - Math.exp(cosSum/t.parameters.length);
	return result;

--------------------------------

// Six hump camel backfunction
	double x1=t.parameters[0];
	double x12=x1*x1;
	double x2=t.parameters[1];
	double x22=x2*x2;
	return (4-2.1*x12+x12*x12/3)*x12+x1*x2+(-4+4*x22)*x22;

--------------------------------

// Golden Price function
	double x1=t.parameters[0];
	double x12=x1*x1;
	double x2=t.parameters[1];
	double x22=x2*x2;
	return (1+(x1+x2+1)*(x1+x2+1)*(19-14*x1+3*x12-14*x2+6*x1*x2+3*x22))
	    *(30+(2*x1-3*x2)*(2*x1-3*x2)*(18-32*x1+12*x12+48*x2-36*x1*x2+27*x22));

--------------------------------