surf and color bar does not show correct color gradient.

The 'surf' command does not show the correct color gradient, e.g. for the 10x10 matrix below

    0.0201    0.0201    0.0201    0.0201    0.0201    0.0201    0.0201    0.0201    0.0201    0.0201    0.0201
    0.0149    0.0149    0.0149    0.0149    0.0149    0.0149    0.0149    0.0149    0.0149    0.0149    0.0149
    0.0057    0.0057    0.0057    0.0057    0.0057    0.0057    0.0057    0.0057    0.0057    0.0057    0.0057
    0.0010    0.0010    0.0010    0.0010    0.0010    0.0010    0.0010    0.0010    0.0010    0.0010    0.0010
    0.0000    0.0000    0.0000    0.0000    0.0000    0.0000    0.0000    0.0000    0.0000    0.0000    0.0000
         0         0         0         0         0         0         0         0         0         0         0
    0.0000    0.0000    0.0000    0.0000    0.0000    0.0000    0.0000    0.0000    0.0000    0.0000    0.0000
    0.0010    0.0010    0.0010    0.0010    0.0010    0.0010    0.0010    0.0010    0.0010    0.0010    0.0010
    0.0057    0.0057    0.0057    0.0057    0.0057    0.0057    0.0057    0.0057    0.0057    0.0057    0.0057
    0.0149    0.0149    0.0149    0.0149    0.0149    0.0149    0.0149    0.0149    0.0149    0.0149    0.0149
    0.0201    0.0201    0.0201    0.0201    0.0201    0.0201    0.0201    0.0201    0.0201    0.0201    0.0201

it shows the figure like this

on the left and right it has same nodal values so it should show the same color gradient. Please help how to fix it.

Many Thanks in Advance.

Abdullah.

Answer 1

[Mike Garrity]

What's happening here is that you have FaceColor='flat'. In this case, it's using your 10x10 matrix as the Z values of the vertices. That means that it's creating a 9x9 grid of quadrilaterals. Because FaceColor='flat' wants to assign one color to each of those 81 quads, it doesn't use the last row and column of your data.

You might want to try FaceColor='interp', like this:

surf(mydata,'FaceColor','interp')

or create separate ZData and CData, like this:

myzdata = randn(10);
mycdata = randn(9);
surf(myzdata,mycdata)

Does that make sense?

[Abdullah Waseem]

Thank you it solves the problem.

[IMRAN]

Correct. Thanks buddy

Answer 2

[Chad Greene]

Follow your plotting command with

shading interp

[Chad Greene]

and if you want to keep the lines of the grid,

s = surf(x); 
shading interp
s.EdgeColor = 'k';

[Abdullah Waseem]

Thank you.