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Evaluating 2D function on 2D grid without using "for" loops

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Luqman Saleem
Luqman Saleem on 21 Aug 2020
Commented: Sara Boznik on 22 Aug 2020
I have a function f(x,y) and I want to evaluate it on x,y grid. For example,
f = @(x,y) x^2+y^2;
x = 1:10;
y = 1:5;
%one way to do it is using for loops.
for x=1:10
for y=1:5
result(x,y) = f(x,y);
Is there any way do it without using "for" loops?
  1 Comment
Stephen on 22 Aug 2020
"Is there any way do it without using "for" loops?"
Why do you want to avoid for loops? Contrary to what some beignners think, (well-written) for loops are not slow.
Is result preallocated before the loops?

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Answers (1)

Sara Boznik
Sara Boznik on 21 Aug 2020
f = @(x,y) x.^2+y.^2;
x = 1:10;
y = 1:5;
[X,Y] = meshgrid(x,y);
meshc(X, Y, f(X,Y))
grid on
You can try that.
Best of luck.

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