Drawing HSV color wheel with MATLAB

%  Generate grid 
tList=linspace(0,2.*pi,300);
rList=linspace(0,1,100);
[theta,R]=meshgrid(tList,rList);

%  The angle and radius are converted into coordinates 
X=cos(theta+pi).*R;
Y=sin(theta).*R;
Z=zeros(size(X));

%  structure hvs surface (nx3) And converted to rgb surface 
thetaV=theta(:);RV=R(:);
hsvList=[thetaV./2./pi,ones(size(RV)),RV];
rgbList=hsv2rgb(hsvList);

%  Turn it into a matrix triplet 
C=zeros([size(X),3]);
C(:,:,1)=reshape(rgbList(:,1),size(X));
C(:,:,2)=reshape(rgbList(:,2),size(X));
C(:,:,3)=reshape(rgbList(:,3),size(X));

% surf mapping 
surf(X,Y,Z,'EdgeColor','none','CData',C)
axis([-1,1,-1,1]);axis equal
view(0,90);