Please, how to plot for this code?

k = -2:0.1:2;
g = ((2*cos(2*k))-2)/(1i*k);
plot(k,g)

Answer 1

[KSSV]

Read about element by element operations.

k = -2:0.1:2;
g = ((2*cos(2*k))-2)./(1i*k);   % use ./
plot(k,abs(g))
hold on
plot(k,real(g))
plot(k,imag(g))
legend('abs','real','imaginary')