Re: Log Error
- To: mathgroup at smc.vnet.net
- Subject: [mg78866] Re: Log Error
- From: Bill Rowe <readnewsciv at sbcglobal.net>
- Date: Wed, 11 Jul 2007 06:17:48 -0400 (EDT)
On 7/10/07 at 6:27 AM, L_Kohn at Nesbittgraphics.com (Laurence Kohn)
wrote:
>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?
In Mathematica Log[x] is the natural logarithm of x not the
logarithm base 10. That would be written Log[10,x].
So,
NSolve[Log[10,x-1]==2,x]
will give you 101. as you are expecting
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