I have a problem with surface parameters (fsurf)

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Jake Simmonds 2018-10-30

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https://ww2.mathworks.cn/matlabcentral/answers/426967-i-have-a-problem-with-surface-parameters-fsurf

评论： madhan ravi 2018-10-30

Hello there, this is my first time using this site for help so if i don't get the etiquette right please do let me know. OK so i am trying to plot the following surface f(x,y)= (3*x^2+y^2)*exp(-x-y) with intervals -2 < x < 2 and -2 < y < 2 i have produced the following code:

syms x y
f(x,y) = (3*x^2+y^2)*exp(-y-x);
fsurf(f,[-2 2 -2 2])

However the results are terrible i have tried changing the parameters and tried using a mesh but i get nowhere. Now i have been using a tool online called Calcplot3D see here https://www.monroecc.edu/faculty/paulseeburger/calcnsf/CalcPlot3D/ this tool displays the function how i would expect it to look, i don't understand why i can't replicate this in matlab.

Any help would be brilliant Best Regards Jake

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madhan ravi 2018-10-30

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https://ww2.mathworks.cn/matlabcentral/answers/426967-i-have-a-problem-with-surface-parameters-fsurf#answer_344216

编辑：madhan ravi 2018-10-30

在 MATLAB Online 中打开

syms x y %edited
f(x,y) = (3*x^2+y^2)*exp(-y-x);
ezsurf(f)
xlim([-2 2])
ylim([-2 2])
zlim([-5 5])

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Jake Simmonds 2018-10-30

Ah ok, it's still not as nice though is it as the plot above? it's an improvement though so thanks. I think i will stick to that web-tool though.

madhan ravi 2018-10-30

If you get used to Matlab you may find it easy to manipulate anyways glad that you got the answer for your question , make sure to accept the answer so that people know that question is solved

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Matt J 2018-10-30

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/426967-i-have-a-problem-with-surface-parameters-fsurf#answer_344219

编辑：Matt J 2018-10-30

在 MATLAB Online 中打开

f = @(x,y) (3*x.^2+y.^2).*exp(-y-x);
fsurf(f,[-2 2 -2 2])

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Jake Simmonds 2018-10-30

Should it not have the dot before *exp ? like so: f = @(x,y) (3*x.^2+y.^2).*exp(-y-x); Also this still does not replicate the function as it should be!!!