Find this integral

  • Thread starter arslan894
  • Start date
  • #1
arslan894
9
0
f(x) = ∫e^(1-(x^2)/(b^2))dx the limits are -b to b , take the value of b = 3
 

Answers and Replies

  • #2
DivisionByZro
252
1
Is this the integral?
[tex]
\int_{-3}^{3}e^\frac{1-x^2}{9}dx
[/tex]
 
  • #3
phyzguy
Science Advisor
5,045
2,045
We're not going to do it for you. What have you tried?
 
  • #4
arslan894
9
0
bro i tried it using substitution but the problem is that i cant go much further, @ DivisionByZro exp(1-(x^2/9))^.5
 
  • #5
DivisionByZro
252
1
Is this it?
[tex]
\int_{-3}^{3}e^\sqrt{1-\frac{x^2}{9}}dx
[/tex]
 
  • #6
arslan894
9
0
yes bro
 
  • #7
DivisionByZro
252
1
Well, in any case, you won't find any substitutions since you don't have any "x" term multiplying the expression, therefore whatever you have in the exponent part can't be reduced. In other words, it wouldn't be as hard if your integral was something like:

[tex]
\int_{-3}^{3}xe^{x^{2}}dx
[/tex]

In this case if you let u=x2, then du=2xdx, and you could use substitution.

In fact there is no answer in terms of standard functions. What class/context was this for?
 
  • #8
arslan894
9
0
i was modeling in matlab to find the friction between cam follower of an engine ,i used int function in matlab but it gave warning that explicit answer doesnt exist ,i used the simpson 38 rule to find the solution on paper but dont know how to use simpson 38 rule in matlab.
 
  • #9
arslan894
9
0
any one knows how to do this function using simpson 3 8 rule in matlab ?
 
  • #11
bhartish
26
0
I also have a doubt . Anybody reply fast


How to integrate

exp(x)*erfc(x) in MATLAB
 

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