How do I make surf accurately reflect my data?

Consider this example:

A=zeros(5);
A(3,3)=1;
surf(A)
view(2)

When viewing this, one would be tempted to think that there's a peak at (3.5,3.5) and not at (3,3). Is there a way to make surf (or another function) show the right color exactly where the peak is?

Of course I want to implement this for more complicated data sets, so a general solution would be very nice.

Answer 1

[Orion]

you can play with shading

A=zeros(5);
A(3,3)=1;
surf(A);
pause(1)
view(2);
pause(1)
shading interp

[Henrik]

Thanks, this helps. What if I for some reason insist on using shading flat, is there anything to be done then?

[Orion]

other toys

%%CData
figure
A = zeros(5);
A(3,3) = 1;
s = surf(A);

CData = get(s,'CData');
CData(2:3,2:3)=1;
set(s,'CData',CData)

%%bar3
figure
B = zeros(5);
B(3,3) = 1;
b = bar3(B);

[Mike Garrity]

Actually using FaceColor=texturemap works here.

A=zeros(5);
A(3,3)=1;
surf(A,'FaceColor','texturemap')
view(2)

What's happening in the FaceColor=flat case is that it's mapping the first 4x4 of the CData to the entire range of XData & YData. It has to do that because a 5x5 grid of XData & YData yields a 4x4 grid of quads.

But with FaceColor=texture, we're mapping the entire 5x5 contents of the CData to the 5x5 range of XData & YData. It can do that because texturemap doesn't have to assign one color per quad. It can split colors across quads so it can do any mapping. You could map a 7x5 CData onto a 3x4 XData & YData if you wanted to. So it gives you a lot of flexibility, but it will also let you make a mess if you're not careful.

[Henrik]

Thank you Mike, this seems to be exactly what I need. If you post this as an answer I'll accept it.