error variable y in fitness function

how to write fitness function in matlab...

please help me.. because im write this is error:

function y=fungsi3(x)

y=2+exp(-(x(1)^2)+(y(1)^2)).*(sin(4*x(1))+cos(8*y(2)));

end

Answer 1

[Stephan]

function y=fungsi3(x)
y=2+exp(-(x(1).^2+x(2).^2)).*(sin(4*x(1))+cos(8*x(2)));
end