Re: Log Error
- To: mathgroup at smc.vnet.net
- Subject: [mg78823] Re: Log Error
- From: Peltio <peltio at twilight.zone>
- Date: Wed, 11 Jul 2007 05:55:02 -0400 (EDT)
- References: <f6vnds$qfr$1@smc.vnet.net>
- Reply-to: peltioNOSP at Mdespammed.com.invalid
As is often the case, nobody knew why. All we know so far is
Where: comp.soft-sys.math.mathematica
When: 10-07-07, 12.35.40
Who: Laurence Kohn
What: see below
> I had a question about something I found in Mathematica 5.2... I was
> plotting Log[x-1]-2 with x = {0,10} and y = {-10,5} and strangely found
> that the graph crossed the x-axes at approximately x == 8 ...
>
> It should be 101 of course, but it seemed like 8. Then I did an Nsolve
> with the equation set to 0, and low and behold got an answer x == 8.38906.
>
> Is this a bug in mathematica or am I missing something here?
Log[x] is the natural logarithm of x. The base is e (or E in Mathematica's
notation).
Indeed E^2+1 = 8.389056...
What you are after is Log[10,x].
cheers,
Peltio
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