CODEWITHSUNDEEP
matlab
Graviton
Graviton

Reputation: 83254

Generate Contour Given X, Y and Z vectors

Given 3 vector-pair, X, Y and Z, how to generate the contour? I understand that we need to make use of the contour plot. But the thing is that we need to pass in a 2x2 matrix for this argument, which presumably, is a matrix of Z corresponding to each X,Y pair. But this would mean that I have to go extra miles to create such a matrix by using griddata interpolation first before talking about contour generation.

Is there any other more succinct method?

Upvotes: 1

Views: 21076

Answers (2)

Zaid
Zaid

Reputation: 37146

MATLAB addresses this need of yours fairly succinctly.

What you need to do is use meshgrid to two-dimensionalize your X and Y vectors. Here is a simple example to demonstrate how to generate a contour plot of z = sin (x^2 + x*y^2):

x = -10:0.1:10;
y = -10:0.1:10;
[x,y] = meshgrid(x,y);
z = sin(x.^2+x.*y.^2);
contour(x,y,z)

Note the use of the .^ and .* notations, which forces MATLAB to conduct an element-by-element evaluation of the z matrix, making it 2D in the process.

Upvotes: -1

user85109
user85109

Reputation:

Yes. Use the Tricontour tool. It is found on the file exchange (on Matlab Central.) This does the contouring as you desire directly, without forcing you to use meshgrid and griddata.

Upvotes: 4

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