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Re: Five days mean values [message #45764 is a reply to message #45761]

Wed, 05 October 2005 14:57

K. Bowman
Messages: 330
Registered: May 2000

Senior Member

In article <1128546470.965721.312300@g49g2000cwa.googlegroups.com>,
"Julio" <julio@cpa.unicamp.br> wrote:

> Hello people,
>
> I have meteorological data from several years, like these:
>
> Date Temp (max) Temp (min)
> 01/08/2001 27.2 12.7
> 02/08/2001 27.8 12.4
> 03/08/2001 26.8 16.3
> 04/08/2001 26.6 12
> 05/08/2001 27.4 11
> 06/08/2001 27.6 16.1
> 07/08/2001 27.6 11.2
> 08/08/2001 28.4 13.4
> 09/08/2001 27.2 10.9
> 10/08/2001 26 9.7
>
> I want to calculate mean value from 01-05 days, 05-10 days, 10-15 days
> and so on.
> In other words, I must get the mean value at each five days.
> I'm trying to make some code to get it automatically. I think this kind
> of work is trivial for meteorological data users. Does anybody have
> some idea?
>
> Regards,
> J�lio

If the data are in an array T, this is a very quick way to compute averages

IDL> T = findgen(15)
IDL> print, T
0.00000 1.00000 2.00000 3.00000 4.00000 5.00000
6.00000
7.00000 8.00000 9.00000 10.0000 11.0000 12.0000
13.0000
14.0000
IDL> print, rebin(T, 3)
2.00000 7.00000 12.0000

but make sure that the number of days is a multiple of 5 and that you have no
missing data. Also, watch out for leap days.

Ken Bowman

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[Message index]

		Re: Five days mean values By: btt on Fri, 07 October 2005 05:10
		Re: Five days mean values By: Michael Wallace on Thu, 06 October 2005 11:04
		Re: Five days mean values By: Julio[1] on Thu, 06 October 2005 10:54
		Re: Five days mean values By: Michael Wallace on Thu, 06 October 2005 07:23
		Re: Five days mean values By: Julio[1] on Thu, 06 October 2005 05:56
		Re: Five days mean values By: K. Bowman on Wed, 05 October 2005 14:57

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