How to surf very small values keeping the same ratio?

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Alexandra Roxana 2023-6-11

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https://ww2.mathworks.cn/matlabcentral/answers/1981424-how-to-surf-very-small-values-keeping-the-same-ratio

评论： Torsten 2023-6-12

采纳的回答： John D'Errico

I'm having a solution with very small values and I need to surf it; this is how a part of the solution looks like:

I'm also using the same aspect ratio and because the values are so small the surf looks like a 2D plot.

It should look as if I would take a pencil and a piece of paper and I would draw it. Is there any way to keep the same aspect ratio but not to look like in the figure? Thank you.

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Answer 1

John D'Errico 2023-6-11

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在 MATLAB Online 中打开

I THINK what you are asking is how to make the surface show there is little variation in z. I'll make up an example...

[X,Y] = meshgrid(0:5,0:6);

Z = (X+Y)*1e-3;

surf(X,Y,Z)

box on

view(-60,10)

And it looks like the surface is doing something significant, when really, it is pretty boring. I'll redo the plot, then add one extra call now.

surf(X,Y,Z)

box on

axis equal

view(-60,10)

So viewed from the same angle, now we see that one of the surfaces is pretty boring, yet the first looks as if something is happening. The difference was the "axis equal" command.

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Alexandra Roxana 2023-6-12

编辑：Alexandra Roxana 2023-6-12

That's right, but the difference between the 0 and 2 on the x-axis and the difference between 0 and 0.002 on the z-axis is almost the same, which in reality isn't.

Torsten 2023-6-12

But how to escape from Flatland if you don't use this trick ? If the differences in one of the three dimensions is small, your plot will be almost 2d - that's a simple fact.

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