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MathGroup Archive 1999

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Re: Re: Re: Bug?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg16062] Re: [mg15899] Re: [mg15854] Re: Bug?
  • From: "Atul Sharma" <mdsa at musica.mcgill.ca>
  • Date: Tue, 23 Feb 1999 03:45:19 -0500
  • Organization: McGill University Computing Centre
  • References: <7allmr$gtg$1@dragonfly.wolfram.com>
  • Sender: owner-wri-mathgroup at wolfram.com

For what it's worth, I get the same error with Mathematica 3.01.1 running
under Win95.

Strangely, if I specify the base E in the Log function, I don't get this
error message, but an incorrect answer.

Integrate[E^x/Log[x, E], x]
Out[12]= -ExpIntegralEi[x] + E^x Log[x]

Differentiating this with respect to x yields E^x Log[x], which the wrong
sign
(the correct answer appears if you use Integrate[E^x/Log[x,-E],x]!!!)

This was an unmodified 'fresh' kernel session, so I'm also perplexed as to
why this is occuring.

A. Sharma

Dennis Swaney wrote in message <7allmr$gtg$1 at dragonfly.wolfram.com>...
>BobHanlon at aol.com wrote:
>>
>>In a message dated 2/12/99 8:49:55 PM, ck at kagi.com writes:
>>
>>>> This does not occur in any Mathematica I have.  Try it again.
>>>> The error message looks like you may have mistyped.
>>>>
>>>> Moderator
>>>>
>>>> > I have found something strange in Mathematica:
>>>> >
>>>> > Integrate[Exp[x]/Log[x],x]
>>>> >
>>>> > which yields the following error message:
>>>> >
>>>> > Log::"argt":
>>>> >     "\!\(Log\) called with \!\(0\) arguments; \!\(1\) or \!\(2\)
>>>> > arguments \
>>>> > are expected."
>>>> >




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