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 derivative of a logistic function		  New Topic  Reply to Topic
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luongh

Canada
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Posted - 08/13/2007 :  12:19:34 PM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
Hi,
I have data that follows a logistic function. So I fit a logistic function through the data (and an equation is given). I would like to take the derivative of this function. Any suggestions on how to do it? Thanks!

Mike Buess

USA
3037 Posts
Posted - 08/13/2007 :  4:29:41 PM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Origin can only numerically differentiate a dataset and then plot the resulting curve. To differentiate the fit curve make sure it is active and select Analysis> Calculus> Differentiate.

If you used the advanced fitter and don't see a fit curve click the fitter's More button (if you see it) and select Scripts> After Fit on the fitter's menu bar. Next, check the Generate Fit Curve option at the top and configure the curve. Finally, select Function> Save from the fitter's menu, repeat the fit and then differentiate the fit curve.

Mike Buess
Origin WebRing Member
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