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integral does not give results

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Bilal Ates
Bilal Ates 2020-8-24
评论： Bruno Luong 2020-8-24
x=sym('x')
int(((x*exp(-x/3))+tan(x)),0,5)
I can't find where I made the mistake, Matlab does not give results

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回答（1 个）

Star Strider
Star Strider 2020-8-24
It works for me (in R2020a):
x=sym('x')
Int = int(x*exp(-x/3)+tan(x),x,0,5)
producing:
Int =
NaN
To understand the results, plot the function:
figure
fplot(x*exp(-x/3)+tan(x), [0,5])
grid
.
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Bruno Luong
Bruno Luong 2020-8-24
This might be useful
syms x
Int = int(x*exp(-x/3)+tan(x),x,0,5,'PrincipalValue',true)

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