function [img] = slice3d(method,whichSlice,data)

sz = size(data);
img = [];

if(method==0)
 img = data(:,:,whichSlice);
end

if(method==1)
 for row = 1:sz(1)
     for col = 1:sz(3)
       img(row,col) = data(row,whichSlice,col);
     end
 end
end

if(method==2)
 for row = 1:sz(2)
     for col = 1:sz(3)
       img(row,col) = data(whichSlice,row,col);
     end
 end
end