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How to use Arbitrary fit to fit y=ln(1+a*x)/a

 
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clwei



Joined: 12 Sep 2016
Posts: 6
PostPosted: Thu Oct 13, 2016 1:18 am    Post subject: How to use Arbitrary fit to fit y=ln(1+a*x)/a Reply with quote
Dear David,

We know that the Arbitrary fit can allows us to specify a function with unkown parameters. But Does it work when using to fit the logarithm equation? for example y=ln(1+a*x)/a, or how to fit the data with y=ln(1+a*x)/a. Thanks for your time!

clwei Smile
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David
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Joined: 25 Nov 2006
Posts: 1919
Location: Chapel Hill, NC
PostPosted: Thu Oct 13, 2016 3:05 pm    Post subject: Reply with quote
It will. However, the ln function is called log, so use the expression

log(1+a*x)/a

I'm using the math convention of log = natural log and log10 is the 10 based log. There is also a log2 for the 2 based log.

David
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clwei



Joined: 12 Sep 2016
Posts: 6
PostPosted: Fri Oct 14, 2016 3:35 am    Post subject: Reply with quote
Thank you David!

clwei
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