visualdatatools.com Forum Index visualdatatools.com
Discussion for DataTank and DataGraph
 
 FAQFAQ   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups   RegisterRegister 
 ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 

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

 
Post new topic   Reply to topic    visualdatatools.com Forum Index -> Request Fit Function
View previous topic :: View next topic  
Author Message
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
Back to top
View user's profile Send private message
David
Site Admin


Joined: 25 Nov 2006
Posts: 1938
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
Back to top
View user's profile Send private message Send e-mail
clwei



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

clwei
Back to top
View user's profile Send private message
Display posts from previous:   
Post new topic   Reply to topic    visualdatatools.com Forum Index -> Request Fit Function All times are GMT - 3 Hours
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum


Powered by phpBB © 2001, 2005 phpBB Group