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 | | From: | Neni | | Subject: | Infinity integral | | Date: | Mon, 24 Jan 2005 02:38:29 -0500 |
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 | Hello Matlabers;
I want to make the integral from minus infinity to 0(zero) using
matlab. Please help me how to do this.
Thank you
Neni
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| | From: | Roger Stafford | | Subject: | Re: Infinity integral | | Date: | Mon, 24 Jan 2005 08:47:09 GMT |
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| In article , Neni wrote:
> Hello Matlabers;
>
> I want to make the integral from minus infinity to 0(zero) using
> matlab. Please help me how to do this.
>
> Thank you
> Neni
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Hello Neni,
It is best if you can devise a change of variable in whatever function
you are integrating so as to convert your range of integration into a
finite range. Then you can use matlab's standard integration technique on
the transformed function. Of course this change should be done carefully
so that the transformed integrand does not shoot up to infinity at one end
of this finite range - the end that corresponds to the previous minus
infinity.
Trying to integrate out to great distances in the minus direction as an
approximation is not a very convenient or elegant approach, but you could
try it as a last desperate measure. Of course you have to be prepared for
the possibility that your integration actually gives infinity as a true
answer - it all depends on the nature of your integrand as you approach
minus infinity.
--
(Remove "xyzzy" and ".invalid" to send me email.)
Roger Stafford
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