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Student Support Forum: 'Possible Incorrect Answer When Integrating' topicStudent Support Forum > General > Archives > "Possible Incorrect Answer When Integrating"

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Author Comment/Response
Rob Gross
09/23/02 5:20pm

I'm trying to find the integral of E^-(jx)*x^n from a to infinity, with the assumption that Re[j]>0. However, to test it out I first integrated E^-(jx)*x^2 from 1 to infinity, and substituted the answer that I got by picking j->2, and I got 0.169169. Then, I integrated ^-(jx)*x^n from 1 to infinity, and substituted the answer that I got by saying j->2, n->2, and I got 0.169169. Fine, everything works, but when I integrated E^-(jx)*x^n from a to infinity, and substituted j->2, n->2, a->1, I got -0.580831. It's the previous answers minus three fourths. Why are there any inconsistencies in these answers?! I need to know which is correct, although I'll probably spend hours going through an integral table in the meantime, which is what I hate doing, and is one of the reasons I purchased Mathematica.

Thanks,
Rob Gross


Attached is the notebook that I used.


Attachment: bug.nb, URL: ,

Subject (listing for 'Possible Incorrect Answer When Integrating')
Author Date Posted
Possible Incorrect Answer When Integrating Rob Gross 09/23/02 5:20pm
Re: Possible Incorrect Answer When Integrating Forum Modera... 10/01/02 10:28am
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