ploting 2 variable function

Hello every one

 i have some problem in plotting a two variable function

i have a matrix with (m x 3)points, so the firest column represent X and the second represent Y and the last column for Z with m points in each one

I have tried using

surf(matix(:,1),matix(:,2),matix(:,3))

but it give me a message error :Z must be a matrix, not a scalar or vector.

and also try to use:

X=[matix(:,1),matix(:,2)];
Z=matix(:,3);
surf(X,Z);

it draw a surf but it seem that it ignore Z

I will be appreciated if any one can help me

[sixwwwwww]

To have surf plot you need to have Z a matrix of size m*n where m = length(X) and n = length(Y). See http://www.mathworks.com/help/matlab/ref/surf.html. But in your case you have vector. So you can use "plot3" or you create matrix Z

[ram]

realy thank you for your help it works well :)

Answer 1

[Yatin]

Hi,

The length of vector X should be the same as number of columns of Z and the length of vector Y go with number of rows of Z .

Below is a sample code snippet:

[rows, cols] = size(Z);
X = 1:cols;
Y = 1:rows;
surf(X, Y, Z);