Plot square surface in Matlab

Question

How to plot a square surface in Matlab?

More exactly I want to plot a square square with value 0.5 surface which is located at X:-1 to X=1 and Y:2.5 to 3.5.

Answer 1

You need to provide multiple Z-values together with the same X, Y values. A small example:

>> [X, Y]= meshgrid([1,2,2,3,4], 1:2)
X =
     1     2     2     3     4
     1     2     2     3     4
Y =
     1     1     1     1     1
     2     2     2     2     2
>> Z = [0,0,1,1,0;0,0,1,1,0]
Z =
     0     0     1     1     0
     0     0     1     1     0
>> surf(X, Y, Z)

Yields this:

This should be the same in 2D, you just need to wrap you head around which X and Y values to duplicate and adjust the Z-Matrix accordingly.