My TI89 can't integrate e^(-x^2)

[beer]

So I'm a Senior engineering student and can't integrate by hand anymore. Help me someone.

 

[Heisenberg]

Isn't it Sqrt(Pi) or something like that? Check a CRC.

 

[Safeway]

Google.

 

[beer]

Originally posted by: Heisenberg
Isn't it Sqrt(Pi) or something like that? Check a CRC.

It is sqrt(pi)/2 but why?

 

[Heisenberg]

Originally posted by: beer

Originally posted by: Heisenberg
Isn't it Sqrt(Pi) or something like that? Check a CRC.

It is sqrt(pi)/2 but why?

Fvck if I know. Why do you actually want to do it by hand? Just use the answer.

 

[fatty4ksu]

http://integrals.wolfram.com/

 

[beer]

Originally posted by: Heisenberg

Originally posted by: beer

Originally posted by: Heisenberg
Isn't it Sqrt(Pi) or something like that? Check a CRC.

It is sqrt(pi)/2 but why?

Fvck if I know. Why do you actually want to do it by hand? Just use the answer.

Because I'm taking a goddamn Fourier/Laplace class for a blowoff summer electrive! And this is a component of a potential test question

 

[Indolent]

well, all I know is I can't do any of that integrating stuff anymore either...

 

[Heisenberg]

Originally posted by: beer

Originally posted by: Heisenberg

Originally posted by: beer

Originally posted by: Heisenberg
Isn't it Sqrt(Pi) or something like that? Check a CRC.

It is sqrt(pi)/2 but why?

Fvck if I know. Why do you actually want to do it by hand? Just use the answer.

Because I'm taking a goddamn Fourier/Laplace class for a blowoff summer electrive! And this is a component of a potential test question

Lol. Only an EE would consider a class like that a blowoff course. Sorry - I don't remember how to do it. They let us use integral tables in physics.

 

[beer]

Originally posted by: Heisenberg
Lol. Only an EE would consider a class like that a blowoff course. Sorry - I don't remember how to do it. They let us use integral tables in physics.

It's not in the tables I have. That's what's interesting.

 

[Heisenberg]

Originally posted by: beer

Originally posted by: Heisenberg
Lol. Only an EE would consider a class like that a blowoff course. Sorry - I don't remember how to do it. They let us use integral tables in physics.

It's not in the tables I have. That's what's interesting.

Whaaaaaaaaaaaa??

You need to stop using cut-rate integral tables. My 30 year old CRC has it.

Edit: Wait, what are the limits you're using?

 

[beer]

Originally posted by: Heisenberg

Originally posted by: beer

Originally posted by: Heisenberg
Lol. Only an EE would consider a class like that a blowoff course. Sorry - I don't remember how to do it. They let us use integral tables in physics.

It's not in the tables I have. That's what's interesting.

Whaaaaaaaaaaaa??

You need to stop using cut-rate integral tables. My 30 year old CRC has it.

Edit: Wait, what are the limits you're using?

[0,inf)

 

[Heisenberg]

Originally posted by: beer
[0,inf)

Yeah, then Sqrt(Pi)/2 is right. If you're going from (inf,inf) then it's just Sqrt(Pi) which is what I must've been thinking. That's odd that it's not in your table.

 

[Oscar1613]

its very tedious to do by hand

 

[akubi]

sqrt(pi)/2

 

[akubi]

Originally posted by: Oscar1613
its very tedious to do by hand

it's very simple to do by hand.

all you have to remember is the trick of squaring the integral and evaluating the double integral in cylindrical coordinates. then take the root of it at the end.