Error "Matrix dimensions must agree" what should I fix?

a =  0.25;
theta = 0;
r = [0:12];
x = (30/2)*((1-(a^2/r.^2))+(1+3*(a^4/r.^4)-4*(a^2/r.^2)*cos(2*theta)))
y = (30/2)*((1+(a^2/r.^2))-(1+3*(a^4/r.^4)*cos(2*theta)))
z = -(30/2)*((1-3*(a^4/r.^4)+2*(a^2/r.^2))*sin(2*theta))
figure(1)
plot(x)
figure(2)
plot(y)
figure(3)
plot(z)

[Stephen23]

@Abdulmohsen Bahabri: today I formatted your code correctly for you. In future you can do it yourself by selecting the code text and clicking the {} Code button.

Answer 1

[KSSV]

a = 0.25;
theta = 0;
r = [0:12];
x = (30/2)*((1-(a^2./r.^2))+(1+3*(a^4./r.^4)-4*(a^2./r.^2)*cos(2*theta))) ;
y = (30/2)*((1+(a^2./r.^2))-(1+3*(a^4./r.^4)*cos(2*theta))) ;
z = -(30/2)*((1-3*(a^4./r.^4)+2*(a^2./r.^2))*sin(2*theta)) ;
figure (1)
plot(x)
figure (2)
plot(y)
figure (3)
plot(z)

element by element division.