can you help me with solving the problem?

 r = 0 : 0.01 :2;
 t = 0.1 : 0.1 : 1;
 K = (r^2)/(sqrt((1-r^2)^2+(2*t*r)^2));
 plot(r,K);

K is error. Error using ==> mpower........ Matrix must be square.

Answer 1

[Star Strider]

You have to vectorise your ‘K’ assignment, and ‘r’ and ‘t’ must have the same number of elements.

This works:

r = linspace(0,2);
t = linspace(0,1);

K = (r.^2)./(sqrt((1-r.^2).^2+(2*t.*r).^2));
plot(r,K);

Vectorising does element-wise operations, and uses the dot operator to indicate it, such as replacing (*) with (.*), (^) with (.^), and (/) with (./).