how can i make a surf from 36 points?
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I've 36 points with a height.
X Y Z
2 2 0.5
2 4 1
2 6 1.5
2 8 2
2 10 2.5
2 12 3
4 2 0.5
4 4 1
4 6 1.5
4 8 2
4 10 2.5
4 12 3
6 2 0.5
6 4 1
6 6 1.5
6 8 2
6 10 2.5
6 12 3
8 2 0.5
8 4 1
8 6 1.5
8 8 2
8 10 2.5
8 12 3
10 2 0.5
10 4 1
10 6 1.5
10 8 2
10 10 2.5
10 12 3
12 2 0.5
12 4 1
12 6 1.5
12 8 2
12 10 2.5
12 12 3
Now i want to make a surf(3D) but, i get a error. Z must be a matrix, not a scalar or vector.
what function should I use?
Thank you
Answers (2)
Adam
on 27 Feb 2015
You need to use meshgrid:
doc meshgrid
to create outputs of the right dimensionality
1 Comment
Dominique Andriessen
on 27 Feb 2015
Joseph Cheng
on 27 Feb 2015
Edited: Joseph Cheng
on 27 Feb 2015
since its nicely ordered and evenly spaced then you can reshape Z vector to
z = reshape(Z,6,6);
along with
[x,y]=meshgrid(2:2:12,2:2:12)
then surf(x,y,z).
as i did it quickly i'd double check that the reshaping of the Z column matches up with the meshgrid of x and y. other wise if i got it mixed up then its reshape()' which will be the transpose.
2 Comments
Dominique Andriessen
on 27 Feb 2015
Joseph Cheng
on 27 Feb 2015
yes... it still has a grid pattern to it. if it doesn't you'd probably want to use interp2 to fill in between. if you do not want to hard code in the grid then you can also do this
x = reshape(example(:,1),6,6)
y = reshape(example(:,2),6,6)
z = reshape(example(:,3),6,6)
figure,surf(x,y,z)
where example is your table above
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on 27 Feb 2015
on 27 Feb 2015
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