Problem obtaining a symmetrical surface using surf

%% Dear matlab user, probably my question is simple but...

%% I would like to plot z=f(x,y) using "surf" with the code below.

%%% In my datas, maximum value (50) of z is at x=y=0 but not in the surface plot.

%%% how can I have the center of the red square at x=y=0 and not at x=y=0.5

%%% thank you.

%%%% denis

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

figure (1)

clf

x=[ -3 -2 -1 0 1 2 3 ];

y=[ -2 -1 0 1 2];

z=[

0 0 0 0 0 0 0

0 0 30 30 30 0 0

0 0 30 50 30 0 0

0 0 30 30 30 0 0

0 0 0 0 0 0 0];

surf (x,y,z)

view([0 90])

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

Answer 1

[Walter Roberson]

You cannot. surf() always uses the interior intersections of the original data as the locations of its vertices, and it can only assign colors at those locations; see the CData property at http://www.mathworks.com/help/matlab/ref/surfaceplotproperties.html

If you want to look down from above like that, use imagesc() instead of surf()

[Denis rouede]

thank you, imagesc is fine