My code is returning a complex array

x = -10:1:10;
for j = -10:1:10    
    y(j+11) = power(2.72,-.2j);
end
plot(x,y);

%im trying to plot the function e^(-.2x) so im trying to create an array to plot

[Torsten]

-.2j means -0.2*i where i is the imaginary unit (sqrt(-1)).

Answer 1

[KSSV]

There is a typo in your code.

x = -10:1:10 ;
y = zeros(size(x)) ;
for j = 1:length(x)
     y(j) = power(2.72,-0.2*j);   %<---missed mulltiplication
end 
plot(x,y);

No need to use loop.

x = -10:1:10;
y = exp(-0.2*x) ;
plot(x,y)