quad函数积分维度不对。

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N/A am 21 Nov. 2022
本人用quad函数积分出现下面错误
The integrand function must return an output vector of the same length as the input vector.
程序
syms x y theta
x=cos(theta);
y=sin(theta);
l=quad(@(theta)sqrt((diff(x))^2+(diff(y))^2),0,pi)
算圆的周长.

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