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Re: Time series. [message #80110 is a reply to message #80106]

Wed, 02 May 2012 07:54

chris_torrence@NOSPAM is currently offline

chris_torrence@NOSPAM
Messages: 528
Registered: March 2007

Senior Member

On Wednesday, May 2, 2012 7:39:10 AM UTC-6, dave poreh wrote:
> On Tuesday, May 1, 2012 8:57:45 PM UTC+2, Chris Torrence wrote:
>> On Monday, April 30, 2012 3:26:44 AM UTC-6, dave poreh wrote:
>>> On Monday, April 30, 2012 9:31:59 AM UTC+2, Mats Löfdahl wrote:
>>>> Den måndagen den 30:e april 2012 kl. 09:15:45 UTC+2 skrev dave poreh:
>>>> > Folks
>>>> > hi,
>>>> > I am doing some Time series analysis and i wish to plot the mean like ( http://imageshack.us/content_round.php?page=done&l=img20 7/6577/screenshotat20120430091.png). I mean i want to plot the *BLUE* points in this graph. i have tryed to do with:
>>>> > Smooth(y, 33)
>>>> >
>>>> > but the result is not what i want. Is there any help on Time series expert please?
>>>> > Cheers,
>>>> > Dave
>>>>
>>>> I think you want to bin your data and then plot the mean y value within each bin vs the mid x point.
>>> Thanks. Now i am thinking about: http://idlastro.gsfc.nasa.gov/idl_html_help/TS_SMOOTH.html
>>>
>>> Cheers,
>>> Dave :-)
>>
>> Hi Dave,
>>
>> At the risk of getting flamed, you can use the undocumented "NSUM" keyword to the PLOT function:
>>
>> r = randomn(s,1000) + findgen(1000)/300
>> void = LINFIT(findgen(1000),r,YFIT=yfit)
>> p = plot(r, 'or', /SYM_FILLED, SYM_SIZE=0.5, NAME='Red data')
>> p1 = plot(r, 'ob', /SYM_FILLED, /OVERPLOT, NAME='Smoothed', nsum=20, /undoc)
>> p2 = plot(yfit, 'g3', /OVERPLOT, NAME='Linear fit')
>> l = legend(POSITION=[0.8,0.3])
>>
>> In this case, setting NSUM=20 just does a simple average of every 20 points and only plots a single point. Here's what it looks like:
>> http://www.flickr.com/photos/79705059@N06/6986758828/
>>
>> Cheers,
>> Chris
>> ExelisVIS
> Dear Chris
> hi
> How could i get the *blue* number for the graph?
> Cheers,
> Dave

Hi Dave,
If you mean get the actual averaged numbers back out of the graph, you can't. Hence the reason for Ken's comment. That NSUM is purely used for visual results, although it would be easy to replicate the result using a simple binned average.
Cheers,
Chris

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[Message index]

		Re: Time series. By: russell.grew on Fri, 04 May 2012 18:08
		Re: Time series. By: d.poreh on Thu, 03 May 2012 22:50
		Re: Time series. By: chris_torrence@NOSPAM on Wed, 02 May 2012 07:54
		Re: Time series. By: d.poreh on Wed, 02 May 2012 06:39
		Re: Time series. By: Kenneth P. Bowman on Tue, 01 May 2012 13:33
		Re: Time series. By: chris_torrence@NOSPAM on Tue, 01 May 2012 11:57
		Re: Time series. By: russell.grew on Mon, 30 April 2012 18:54
		Re: Time series. By: d.poreh on Mon, 30 April 2012 02:26
		Re: Time series. By: Mats Löfdahl on Mon, 30 April 2012 00:31

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