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 Non-linear constraints for user-defined fit curve		  New Topic  Reply to Topic
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Hoppala

Germany
2 Posts
Posted - 11/14/2014 :  03:14:48 AM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
Origin Ver. and Service Release (Select Help-->About Origin): OriginPro 9.1G
Operating System: Win 7

Hello community!

I have a problem setting a constraint for a user defined non-linear curve of the formula
y = A0 + A1*x + A2*x^2 + A3/x.

I need the curve to fulfill the condition
y(298) = 0 (or 0 = A0 + A1*298 + A2*298^2 + A3/298 )
but I have no idea how to do that.

All I found so far, only deals with linear constraints, e.g. A0 < 0 etc. Thanks in advance for any help.

Echo_Chu

China
Posts
Posted - 11/14/2014 :  04:02:01 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hi,

This in fact still a linear constraint. You can look at the tutorial below for steps of the similar problem.

http://www.originlab.com/doc/Tutorials/Fitting-FixThroughPoint#Use_Linear_Constraint

Echo
OriginLab Corp.
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Hoppala

Germany
2 Posts
Posted - 11/14/2014 :  05:25:50 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Oh my gosh, that was TOO easy. I never thought of that.
Thank you very much!
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