How can I plot a constant Z value with varying X and Y ?

I want to plot a value of Z=3 for X=1:50 and Y=1:50 so that I can get a plane surface plot. Any suggestions please?

Answer 1

[Torsten]

[X,Y] = meshgrid(1:50,1:50);
Z=3*ones(length(Y),length(X));
surf(X,Y,Z);

Best wishes

Torsten.

[Stephen23]

 Z = 3*ones(size(X));

[Jasnoor Singh]

Thanks a ton! One more question, is it possible to display the text "Z=3" anywhere on the graph?

[Torsten]

help text

help title

Best wishes

Torsten.

[Tien Tran]

Hi Torsten

If Z is different values corresponding with each value of x and y. How can I plot a surface?

Best wishes,

Kha Tien

[Torsten]

f=@(x,y) ...;
for j=1:length(X)
  for i = 1:length(y)
    Z(i,j)=f(X(j),Y(i));
   end
 end 
 surf(X,Y,Z);

where in function f, you will have to define which value Z should take in point (x,y).

Best wishes

Torsten.

[Tien Tran]

I understand that, but Z is obtained from experimental data, it is not a function of x and y. Can I plot it?

[Torsten]

https://www.mathworks.com/matlabcentral/fileexchange/5105-making-surface-plots-from-scatter-data

Best wishes

Torsten.