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Re: help on creating a mean array of data [message #45981 is a reply to message #45949]

Fri, 21 October 2005 11:11

Benjamin Hornberger is currently offline

Benjamin Hornberger
Messages: 258
Registered: March 2004

Senior Member

pimpk24@hotmail.com wrote:
> hello, iam very new to idl and would appreciate any help anyone could
> give on performing the following task:
>
> I have a large array of data which is meteorological data from multiple
> days. The data for each day is consistent (i.e. same amount) and i need
> a program that can average each kind of data
>
> For example, I have something like the following:
>
> day a :
> temp-1
> temp-2
> temp-3
>
> day b :
> temp-1
> temp-2
> temp-3
>
>
>
>
> and I need the following:
>
> day a+b:
> temp-1
> temp-2
> temp-3
>
>
> thanks for any feedback
>

If you have one array which looks like

t = [dayA_t1, dayA_t2, dayA_t3, dayB_t1, dayB_t2, dayB_t3]

you can do the following

;; turn array into a 2-dimensional array with one day per row
;; and one temperature per column
t = reform(t, n_temps, n_days, /overwrite)

;; calculate daily average for each temperature. total(.., 2)
;; will sum over the 2nd dimension (sum up all days),
;; then divide by the number of days.
t_avg = total(t, 2) / n_days

Good luck,
Benjamin

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[Message index]

		Re: help on creating a mean array of data By: Rick Towler on Mon, 24 October 2005 11:09
		Re: help on creating a mean array of data By: Benjamin Hornberger on Fri, 21 October 2005 11:11
		Re: help on creating a mean array of data By: news.qwest.net on Fri, 21 October 2005 11:13

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