Computing the double integral of a surface

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Andromeda
Andromeda 2021-10-30
评论： Andromeda 2021-10-30
I am trying to compute the double integral of a surface but I keep getting the error "First input argument must be a function handle." and I do not understand what that means. How can I get around this error? See attached picture below.

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Alan Stevens
Alan Stevens 2021-10-30
Ran in:
Like this
syms x y
z = @(x,y) x.^2 + y.^2;
surface_int = integral2(z,1,2,4,9);
disp(surface_int)
233.3333
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Alan Stevens
Alan Stevens 2021-10-30
The @(x,y) is Matlab's way of defining an in-line function of x and y (rather than having z(x,y) as you might find in other programs).
The .^, rather than just ^ indicates raise to the power element by element if x (or y) is more than a single scalar value when the function is called. Since integral2 calls the function, z, with a matrix of values, .^ is needed.

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