Plot surface from non-anonymus function

Question

Santiago Ortiz Laverde 2021-2-27

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/757579-plot-surface-from-non-anonymus-function

评论： Star Strider 2021-2-27

Hello guys,

I'd like to plot a surface from a global function. I don't know how to create the function, so it is applied to every value in a multidimensional array (mesh grid). There plenty of examples using anonymous functions, but I haven't found any from a non-anonymous one (which I call "global").

Take this function as an example

function z = test(w)
    x = w(1);
    y = w(2);
    z = 2*x.^2 + 2*y.^2 +10*(1.1*y.^2 +3*x.^2).^0.5;
end

Is it possible?

Regards,

Santiago

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Answer 1

Star Strider 2021-2-27

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https://ww2.mathworks.cn/matlabcentral/answers/757579-plot-surface-from-non-anonymus-function#answer_634574

在 MATLAB Online 中打开

See if this does what you want —

function z = test(w)
    x = w{1};
    y = w{2};
    z = 2*x.^2 + 2*y.^2 +10*(1.1*y.^2 +3*x.^2).^0.5;
end
x = -10:10;
y = -15:5;
[W{1},W{2}] = ndgrid(x,y);
Z = test(W);
figure
surf(W{1},W{2},Z)
grid on

Note that I created ‘w’ as cell arrays to pass its elements as matrices. Other than that change, your function is as you wrote it.

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Santiago Ortiz Laverde 2021-2-27

Thank you!, It worked. I just didn't know about 'cell arrays'.

Star Strider 2021-2-27

As always, my pleasure!

They’re quite useful!

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Answer 2

Hernia Baby 2021-2-27

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/757579-plot-surface-from-non-anonymus-function#answer_634579

编辑：Hernia Baby 2021-2-27

在 MATLAB Online 中打开

clc,clear,close all;
w = [1:10;2:11];
x = w(1,:);
y = w(2,:);
f = @(x,y) 2*x.^2 + 2*y.^2 +10*(1.1*y.^2 +3*x.^2).^0.5;
[X,Y] = meshgrid(x,y);
z = f(X,Y);
figure
surf(X,Y,z)
grid on