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MathGroup Archive 1999

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Re: Re: Re: Bug?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg16033] Re: [mg15970] Re: [mg15854] Re: Bug?
  • From: BobHanlon at aol.com
  • Date: Sat, 20 Feb 1999 02:52:14 -0500
  • Sender: owner-wri-mathgroup at wolfram.com

In a message dated 2/19/99 3:37:40 PM, nfares at aol.com-noauto writes:

>I also get the same response, specifically:
>
>Integrate[Exp[x]/Log[x], x]
>
>Log::argt: Log called with 0 arguments; 1 or 2
>     arguments are expected.
>
>I'm running Mathematica 3.0.1.1.x (front end) and 3.0 (kernel) on a Power
>Macintosh G3.
>
>A workaround that I've found is to type:
>
>Integrate[ Exp[x] / Log[x,E], x ] // InputForm
>
>-ExpIntegralEi[x] + E^x*Log[x]
>
>It seems the problem may be localized to Macintosh OSes.
>

Nabil,

Unfortunately, your workaround does not work. This can be verified by 
differentiating your results.  The reason that you arrived at the wrong 
result is that Log[x] is Log[E, x] not Log[x, E].

Even if you use Log[a, x] (in hopes of later substitution of a by E)  
Mathematica returns the same error message.

Bob Hanlon


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