CODEWITHSUNDEEP
matlab
jacobianism
jacobianism

Reputation: 226

Matlab surface plot (with unusual input)

I wish to make a 3D plot in matlab using the following data:

x = [1,1,1,1,2,2,2,2,3,3,3,3];
y = [1,2,3,4,1,2,3,4,1,2,3,4];
F = [4,5,6,7,5,6,7,8,6,7,8,9]; % for example

where F=F(x,y) in a function of x and y. (Ie F(1,1) = 4, F(1,2) = 5, F(1,3) = 6, reading down each column.)

To give an idea of the plot I would like to make: If I knew the function F(x,y) analytically I would use the following code:

xvec = [1,2,3];
yvec = [1,2,3,4];
[X,Y] = meshgrid(xvec, yvec);
Fvalues = F(X,Y); % where F = @(x,y) ... has been defined
surf(X,Y,Fvalues);

Upvotes: 0

Views: 112

Answers (1)

Autonomous
Autonomous

Reputation: 9075

You are missing a very simple trick here. You are getting 4x3 matrices - X and Y. You just have to arrange F in the proper format and then use surf command. Write your code as follows:

xvec = [1,2,3];
yvec = [1,2,3,4];
[X,Y] = meshgrid(xvec, yvec);

%reshaping F
F=reshape(F,4,3); 

surf(X,Y,F);

Upvotes: 2

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