how to use fit in logY ?

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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 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.

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