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help with contour plot

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Hanna Sundling
Hanna Sundling 2020-4-29
关闭： MATLAB Answer Bot 2021-8-20
Trying to plot.
The equation is:
A tip in polar coordinates:
And my code:
(The picture above is how it is supposed to look9
  1 个评论
Walter Roberson
Walter Roberson 2020-4-29
Note that volunteers are seldom interested in typing in code from pictures of code. Make it easier for the volunteers by providing actual code.

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回答（1 个）

Walter Roberson
Walter Roberson 2020-4-29
Your line with == computes whether each element of Z happens to have a particular and exact relationship to X and Y. Once it has done that computation of whether there is a match or not, your code then throws away that computation, having wasted time but otherwise not having done anything useful.
I would suggest to you,
Z2 = X.^2 + Y.^2 + 1;
surf(X, Y, Z2)
  4 个评论
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Hanna Sundling
Hanna Sundling 2020-4-29
I do not understand how I sholud change.
I tried writing Z1 = Z2.^2 an then surf(X,Y,Z1)
Walter Roberson
Walter Roberson 2020-4-29
surf() one thing. "hold on". surf() another thing that is mirror in Z.

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