Logarithmic best-fit line

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Jonathan Moorman
Jonathan Moorman 2020-12-10
评论： Walter Roberson 2020-12-10
Hi all,
I have two vectors x and y, and I need to add a logarithmic best-fit line to the graph. This is a pretty easy feature to add on excel, but I am having trouble doing it in Matlab. Could someone please write some script using the two vectors on how to accomplish this? (Also, please no links. I tried to follow other Mathworks answers, but I still am not understanding this. Thanks!
Below is what the best fit line looks like on Excel (for reference to what I am asking)

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Walter Roberson
Walter Roberson 2020-12-10
No. You have negative y data, and logarithmic fit of that would go complex valued.
If you only want the x to be logarithmic, then either use semilogx() or else plot in your normal way and the set the XScale property of the axes to 'log'
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Walter Roberson
Walter Roberson 2020-12-10
When I search around, I do not find the possibility of there being a linear shift in anything called a "logarithmic fit". I only find that the log space might have a linear shift -- which corresponds to a multiplicative constant in linear space.

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