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Plot surface from non-anonymus function

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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;
Is it possible?

Accepted Answer

Star Strider
Star Strider on 27 Feb 2021
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;
x = -10:10;
y = -15:5;
[W{1},W{2}] = ndgrid(x,y);
Z = test(W);
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.
Star Strider
Star Strider on 27 Feb 2021
As always, my pleasure!
They’re quite useful!

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More Answers (1)

Hernia Baby
Hernia Baby on 27 Feb 2021
Edited: Hernia Baby on 27 Feb 2021
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);
grid on

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