How to use 2 variable in for loop?

I want to use 2 variable in for loop. If we consider a circle then in polar coordinate I've already used r variable. Now I want to consider theta too. For eg.

i = 360;
 for j =1:i
    
    n = 1.5 ;
    th(j) = j*pi/180 ;
    
    X(j) = sin(th(j)) ;
    
 end 
 figure(1)
  plot(th*180/pi,X)

It give me a 1D line. Let us say for theta = 0. I want the whole range of theta from 0 to 360 to make it a 2D plot. How do I do that?

[U B]

I understood now, the question is not clear. The below image was in my mind when I asked the qiestion. Lets say for Theta= o line we have the set of value or sin function from the for loop. I wanted to expand the same value of sin(r) for theta 0 to 360 continousely. I'm showing only 4 theta position in the image. I'm aware its not going to be a simple code. I wanted have some input from others too.

Answer 1

[U B]

Found the solution.

rho = linspace(0,50,100); Nrho = length(rho); lambda = 50; k = 2*pi/lambda;

S00_1 = sin(k.*rho);

phi = 0:pi/30:2*pi; Nphi = length(phi);
[Rho,Phi] = meshgrid(rho,phi);

cPhi = cos(Phi); X = Rho.*cPhi; 
sPhi = sin(Phi); Y = Rho.*sPhi;

S00 = zeros(Nphi,Nrho);
for i = 1:Nphi
    S00(i,:) = S00_1;
end

figure, mesh(X,Y,S00);

[Star Strider]

That looks nothing like what you asked for in the earlier image!

If you want help on something in the future, ask the actual question you want an answer to.