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 Lambert W function

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T O P I C    R E V I E W
LionAM Posted - 12/07/2010 : 5:08:51 PM
Hello,
is the Lambert W function already included in Origin? Or do I have to calculate the values on my own? I would like to use it for fitting some data.

Thank you in advance.
Alex

Origin Ver. 8 and Service Release 6 (Select Help-->About Origin):
Operating System: Windows XP
6   L A T E S T    R E P L I E S    (Newest First)
HHuni Posted - 01/10/2013 : 11:14:35 AM
Hello,

I tried to find the announced Lambert W function for fitting to progression curves in Origin 9.0 but wasn't able to find it. Has the function been included into version 9?

Best wishes,
Matthias
Sam Fang Posted - 05/23/2012 : 11:03:27 PM
Lambert W function is already available in OriginC of Origin8.6. For the function's information, you can see the page.
http://www.originlab.com/pdfs/nagcl09/manual/pdf/c05/c05bac.pdf

Thanks for your suggestion.

We will provide a simple form of the function for users to call easily in OriginC and LabTalk. Since Origin9.0 will support implicit fitting, we can also provide it as a built-in implicit fitting function. I have added it to our bug tracking database ID: ORG-5788, ORG-5789.

Can you tell us the function's form for Lambert W function in fitting? e.g. fitting parameters. It will be better if you can send us sample fitting data for the function.

Thanks.

Sam
OriginLab Technical Services
fliozzi Posted - 05/22/2012 : 04:40:40 AM
The Lambert W function is important in electronics is required, when they are going to incorporate, what have promised a while.
Thanks.

I`am electronic engineering student.
easwar Posted - 12/10/2010 : 09:15:17 AM
Hi Alex,

Thank you for suggesting this. As Larry mentioned we don't have this function currently. It is available in NAG Library Mark 9 (real values) but currently we include NAG Mark 7 in Origin. In future Origin version we will be updating to NAG Mark 9 and then this function will be available.

Easwar
OriginLab
LionAM Posted - 12/08/2010 : 5:16:25 PM
Thank you,
I'm only interested in the real part of the function, with positive argument. So this should not be a problem (an although the definition of the function is implicit, you can express it explicitely by an iterative approximation).

Alex
larry_lan Posted - 12/07/2010 : 8:34:21 PM
Hi:

No this build-in function. Besides, the non-linear fitting tool doesn't supports complex number and implicit function.

Thanks
Larry

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