- To: mathgroup at smc.vnet.net
- Subject: [mg5139] Re: [mg5119] Integration..Constants
- From: Sherman Reed <Sherman.Reed at worldnet.att.net>
- Date: Wed, 6 Nov 1996 01:33:00 -0500
- Sender: owner-wri-mathgroup at wolfram.com
At 03:04 AM 10/31/96 +0000, you wrote:
>I have tried several times to perform an integration(math..2.2.3)B
>similar to the following.
>In:=Integrate[(ao+x)^-1 (bo^-2), x]
>The results, however, are always incorrect:
>Out=-ln(-ao+x) <---where the constant "ao" should be positive.
>Note: The above is not the exact problem and solution. It is only an
>example of the type of problem I have been having with the program.
>I have tried to specify the value of "ao" before integrating:
>or a combination of the two.
>I have also tried:
>To try and get a positive result. I have also tried MathCad 6.0+ and
>gotten the same results. It appears to be a problem for both programs.
>(For those that might think that I am the one with the problem, I would
>like to say that a tenured prof and a postdoc agreed that there is a
>problem with the program). If you know of a solution, or can point me in
>a different direction, I would greatly appreciate it. This would save me
>from having to contact Wolfram about his program.
>---------------------------------- -Dennis M. Winters -
>-P.O. BOX 21215 -
>-EMORY UNIVERSITY -
>-ATLANTA, GA 30322 -
>-dwint01 at emory.edu -
>-or winters at euch6h.chem.emory.edu-
I have 2.2.2 on a notebook and I get the correct result, specifically
Out=(Log[ao + x]\/bo\^2\)
I have 3.0 on a Pent 166, Win 95, and I get the exact same result.
I also have 2.2.1 on a NeXT which gets the same result.
I would be glad to look at your problem, if you care to share it in more
detail. I am more impressed with results than either postdocs or tenured
faculty. I taught Numerical Methods using Mma for 5 years at UTA.
Sherman C. Reed
Sr. Lecturer, University of Texas at Arlington (Retired)
AT&T-Bell Laboratories (Retired)
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