Integration over function between two limits

Question

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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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Answer 1

KALYAN ACHARJYA 2019-12-3

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syms x
f_x=@(x) sin(x)
q = integral(f_x,0,pi)

Sharath Kumar 2020-1-16

Thank You kalyan ! It worked.

Answer 2

Walter Roberson 2019-12-3

0 个投票

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.

Sharath Kumar 2020-1-16

Thanks Walter !