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cmcelm

USA
1 Posts
Posted - 10/17/2019 :  4:26:43 PM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
Origin Ver. and Service Release (Select Help-->About Origin): Origin 2019 9.6.0.172
Operating System: Windows 10

Hi all,

I am trying to create a custom function to fit a set of data to, but the fit is just producing a straight line. I do not know what I'm entering wrong.

The function I want to fit to is y=-log10((10^-A*x)+B) where y is the dependent variable, x the independent, and A and B are parameters. I don't know if my equation syntax is wrong, or what the problem is.

YimingChen

1691 Posts
Posted - 10/17/2019 :  4:48:43 PM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hi,

Please use the expression:
y=-log((10^-A*x)+B)


See if it works.

James
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