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Re: Best fit line for sinusoid [message #92011 is a reply to message #92010] Wed, 30 September 2015 07:37 Go to previous messageGo to previous message
David Fanning is currently offline  David Fanning
Messages: 11724
Registered: August 2001
Senior Member
liam.steele@gmx.co.uk writes:

> I was wondering if there was a 'simple' way to get IDL to plot a best fit line for a sinusoidally-varying data set. For example, say temperatures were recorded each hour for 5 days at a certain location, with each measurement having an error of 2 deg C. Then we would have something like:
>
> day = findgen(121)/24
> temp = 15 + 10*sin(10*!pi*findgen(121)/120) + 5*randomu(seed, 121)
> error = fltarr(121)+2
>
> Is it possible from these three arrays for IDL to work out and plot a best fit line? I have searched online, and can't really find what I'm looking for. (surprisingly I have never had to plot a best fit line to anything before!)

You will do well to start here:

http://cow.physics.wisc.edu/~craigm/idl/fitting.html

Cheers,

David
--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.idlcoyote.com/
Sepore ma de ni thue. ("Perhaps thou speakest truth.")

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