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jmorisen

France
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Posted - 05/26/2005 :  12:40:35 PM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
Origin Version (Select Help-->About Origin): 7.5
Operating System:XP

Hello!

My problem is with the non-linear curve fitting : I have defined a new function successfully,but i would like Origin compute my function in Log. I've tried to do this directly,for exemple y=(a*b)^n become log(y)=n*log(a*b), but the program can not compile it.

Thanks

Leo_Li

China
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Posted - 05/26/2005 :  9:49:48 PM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hello,

Use y = 10^(n*log(a*b)) if the logarithm is 10 based;
Use y = exp(n*ln(a*b)) if it is e based;

Does this work?
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