How to place Contourf at a new height?

Question

Bolin 2017-4-16

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/335657-how-to-place-contourf-at-a-new-height

回答： Star Strider 2017-4-16

I have the following plot and the Contourf.

By default, Contourf will always be generated at height Z = 0 i.e. the horizontal plane. I would like to shift Contourf to height Z = -2, this is so the contour will be placed under the graph of my function. How do I achieve this?

Code:

x = linspace(0,1,1000);
y = linspace(0,1,1000);
[X,Y] = meshgrid(x,y);
Z = -X.^2 - Y.^2;
mesh(X,Y,Z)
box on
hold on
contourf(X,Y,Z)

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Answer 1

Star Strider 2017-4-16

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/335657-how-to-place-contourf-at-a-new-height#answer_263215

在 MATLAB Online 中打开

This seems to work:

x = linspace(0,1,1000);
y = linspace(0,1,1000);
[X,Y] = meshgrid(x,y);
Z = -X.^2 - Y.^2;
mesh(X,Y,Z+2)
box on
hold on
contourf(X,Y,Z+2)
zt = get(gca, 'ZTick');
set(gca, 'ZTick',zt, 'ZTickLabel',zt-2)
view([15  35])