how to use fit in logY ?

2 views (last 30 days)
davit petraasya
davit petraasya on 15 Apr 2016
Commented: davit petraasya on 27 Apr 2016
Hi Does anybody knows how to use fit in log(Y). I mean I have x and y data, I am plotting it and fitting points by straight line using matlab toolbox. When I take log in Y axis my straight fit line becomes curve line. I want straight line fit not curve fit.
How I can get straight fit line in log y plot?
Any advice appreciated.

Accepted Answer

Ced
Ced on 15 Apr 2016
A line which is straight in a linear plot will always be curved in a log plot...? If you want it to be straight in a log10 plot, your original fit has to be exponential 10^x.
What you can do is e.g. get a linear fit g(x) to log10(y), and then f(x) = 10.^g(x) will be your actual regression function (which is obviously exponential).
  1 Comment
davit petraasya
davit petraasya on 27 Apr 2016
Thanks Ced, for your help.

Sign in to comment.

More Answers (0)

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!