how to get values of a square matrix at an degree from center & how to get end points of y

I have a matrix i.e 400x400

I am at 200,200 now I want to take all values of matrix at an angle

I can think of this but not for any degree? how to do this?

   h_180=h(200:400,200);
    h_0=h(1:200,200);
    h_90=h(200,200:400);
    h_270=h(200,200:-1:1);

for phi=0:359
        x=[200,200+199*cosd(phi)];
        y=[200,200+199*sind(phi)]; % Y how to get end points? as its a square
        c(:,phi)=improfile(h,x,y)
    end

How to get value of y at the end?

Answer 1

[Walter Roberson]

improfile() if you have the Image Procesing Toolbox.

If not, then the code for improfile() is based upon interp2()