Solving Integrals with Matlab

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Jerald Johnson
Jerald Johnson 2019-4-22
回答： Star Strider 2019-4-22
Hi everyone, i am working on a calculus problem that requires me to use Lobatto Quadrature and Global Adaptive Quadrature but i keep getting an error. Could someone explain how to write a code for this? Thanks.
Problem: f(x)=integral sign(3x^2)dx. Upper bound is 8 and lower bound is 0 on the integral sign.
% Lobatto Quadrature
A3= quadl(@(3*x,x(1),x(end))
% Global adaptive quadrature
intfun=@(x) (3*x.^2)
A4=integral(Intfun,x(1),x(end))

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回答（1 个）

Star Strider
Star Strider 2019-4-22
There is an error in the anonymous function in ‘A3’, and since MATLAB is case-sensitive, ‘Intfun’ is not the same as ‘intfun’. Also note that the functions for ‘A3’ and ‘A4’ are different.
This runs:
% Lobatto Quadrature
A3= quadl(@(x)3*x,x(1),x(end))
% Global adaptive quadrature
intfun=@(x) (3*x.^2)
A4=integral(intfun,x(1),x(end))
(I provided my own ‘x’ vector to test it.)

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