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VolkerPresser
Germany
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 Posted - 08/28/2006 : 3:19:44 PM
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Origin Version (Select Help-->About Origin): 7.5
Operating System: WinXP
Hi there,
I just tried (and failed) to fit an equation of the type:
y = a*((b*y)/b-(b*y)/c)^d
with b and c as constant values and b and d as variables.
... or is Origin not capable of handling an equation with y on both sides? Any suggestions, how to solve this problem otherwise??
Thank you all in advance! 
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Hideo Fujii
USA
1582 Posts |
Posted - 08/28/2006 : 4:42:24 PM
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Hi VolkerPresser,
You can try the method I wrote at:
http://www.originlab.com/forum/topic.asp?TOPIC_ID=3934
That is, you can create an extra column for the new dependent variable, say Z, in addition to your independent variables, b, d, and now-independent y. Put zeros in the cells in the Z column, and fit these data with:
Z=f(b,d,y)=a*((b*y)/b-(b*y)/c)^d-y (=0)
Give good initial parameters to get a good result. I could successfully fit points on a circle, for example.
Hope this helps to solve your problem.
--Hideo
OriginLab
Edited by - Hideo Fujii on 08/28/2006 5:06:19 PM |
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can origin handle an equation like: y = a*(y/b)^c?