Integration over function between two limits

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Sharath Kumar
Sharath Kumar 2019-12-3
评论： Sharath Kumar 2020-1-16
format compact
syms x
f(x) = sin(x)
q = integral(f(x),0,pi)
when I run this I am facing the following error :
"Error using integral (line 82)
First input argument must be a function handle.
Error in integ (line 4)
q = integral(f(x),0,pi) "
Could you please explain why i am unable to put f(x) as a first input argument in the integral after defining the variable x.

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回答（2 个）

KALYAN ACHARJYA
KALYAN ACHARJYA 2019-12-3
syms x
f_x=@(x) sin(x)
q = integral(f_x,0,pi)
Walter Roberson
Walter Roberson 2019-12-3
integral() is used only for numeric integration.
For symbolic integration, use int() if you want to see the closed form solution (if it exists), or use vpaintegral() for symbolic numeric solutions.

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