Example usage of function shiftmatrix.

xystep=0.05;
x=-1:xystep:1;
[xx yy]=meshgrid(x);
in=sin(2*pi*xx).*cos(2*pi*yy);

in(1,1)=2; in(end,end)=-2; % Mark the first and last pixels.

figure(1); clf; colormap hot; set(1,'defaultaxesfontsize',14);
subplot(121);
imagesc(x,x,in); axis square;  axis xy;
padval=0; title('In');

shiftvec=[0.3 0.2]; %0.3 distance to right, 0.2 distance up.

out=shiftmatrix(in,xystep,shiftvec,'circular');
subplot(122);
imagesc(x,x,out); axis square; axis xy;
title('Out');