Why am I getting the error "Array indices must be positive integers or logical values."?

clear all;clc;

x=1;y=2
a=0.25   
k=2;n=5;
u=real(complex(k,n)+sqrt(complex(k,n).^2-4.*a.^2))
v=imag(complex(k,n)+sqrt(complex(k,n).^2-4.*a.^2))

kfinal=(x.*(u.*x-v.*y)-y(u.*y+v.*x))./(x.^2+y.^2)+a.^2.*(x.*(u.*x-v.*y)+y(u.*y+v.*x))./((u.*x-v.*y).^2+(u.*y+v.*x).^2);
nfinal=(x.*(u.*y+v.*x)+y(u.*x-v.*y))./(x.^2+y.^2)+a.^2.*(x.*(u.*x+v.*y)-y(u.*x+v.*y))./((u.*x-v.*y).^2+(u.*y+v.*x).^2);

Error :

Array indices must be positive integers or logical values.

Error in deneme (line 9)

kfinal=(x.*(u.*x-v.*y)-y(u.*y+v.*x))./(x.^2+y.^2)+a.^2.*(x.*(u.*x-v.*y)+y(u.*y+v.*x))./((u.*x-v.*y).^2+(u.*y+v.*x).^2);

Answer 1

[Sulaymon Eshkabilov]

Hi,

You have overlooked .* after y:

kfinal=(x.*(u.*x-v.*y)-y.*(u.*y+v.*x))./(x.^2+y.^2)+a.^2.*(x.*(u.*x-v.*y)+y.*(u.*y+v.*x))./((u.*x-v.*y).^2+(u.*y+v.*x).^2);
nfinal=(x.*(u.*y+v.*x)+y.*(u.*x-v.*y))./(x.^2+y.^2)+a.^2.*(x.*(u.*x+v.*y)-y.*(u.*x+v.*y))./((u.*x-v.*y).^2+(u.*y+v.*x).^2);