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Re: How to get the Z value of a point (X,Y) from surface plot?

From: Brett Green
Subject: Re: How to get the Z value of a point (X,Y) from surface plot?
Date: Fri, 19 Jul 2019 17:02:32 -0400

Do you want it in the plot specifically? I don't know how to do that, but if you just want the data, then I would find out what indices the (X,Y) values correspond to, and then check the value in the matrix C with those indices. For example, if (X,Y)=(A(i),B(j)) then the value should be C(i,j).

- Brett Green

On Fri, Jul 19, 2019 at 4:45 PM Burak Kaymakci <address@hidden> wrote:
How can I get the Z value of a given point (X, Y) on a surface plot using octave-cli?

I am creating a simple surface plot using the code below. I am just playing around with the functions and plots to see what I can do and understand how to use them.

A = [1 2 3 4 5 6];
B = [7 8 9 10 11 12];
C = magic(6);

surf(A, B, C);

What I want is to get the value of a given point (X, Y) from the surface plot I've created with the given code above.

For example, on MATLAB you can get a value by hovering over a point on the plot, like in below screenshot.

But on Octave when you hover over the plot you just get (X, Y) values.

Actually when you use `Z1 = interp2(A, B, C, X1, Y1)`, you can get the result too, but, as far as I know, this is not getting the data from the plot.

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