# how to code surf graph?

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bahareh bshrt on 17 Feb 2021
Commented: bahareh bshrt on 17 Feb 2021
X=0:0.01:0.2;
Y=0:0.01:0.2;
T=a matrix with 441*1 dimension that start from 22 to 36
Z=zeros(441,1);
Z=T;
how can i code a surf graph (X , Y,Z)?
KALYAN ACHARJYA on 17 Feb 2021
It's clearly stated in MATLAB Doc, the grid planes are form with the x and y dimentions. And the third z component represents the height of the particular grid.
X=0:0.01:0.2;
Y=0:0.01:0.2;
Next Form the grid plane
[x1,y1]=meshgrid(X,Y);
The result would be as following
Next task: Assign the Z value (Hence Z must be MATRIX, as you have to assign the value in the respective grids)
Here I have created any random matrix with size MxN (M=size of X,N=size of Y) and MATRIX values in the range of 22 and 36, as you have mentioned in the question.
Z=randi([22,36],[length(X),length(Y)]);
Surf plot
surf(x1,y1,Z);
Please refer the MATLAB Docs surf and see the dimensions of all x,y,z, it would be much easy to understand.

KSSV on 17 Feb 2021
x = 0:0.01:0.2 ; nx = length(x) ;
y = 0:0.01:0.2 ; ny = length(t) ;
[X,Y] = meshgrid(x,y) ;
Z = reshape(z,nx,ny) ;
surf(X,Y,Z)
bahareh bshrt on 17 Feb 2021
Thank You so much