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Re: help array subscripting [message #49100]

Mon, 26 June 2006 09:38

JD Smith
Messages: 850
Registered: December 1999

Senior Member

On Sat, 24 Jun 2006 11:21:48 -0700, pimpk24 wrote:

> Hello all,
>
> I am looking for a more efficent way to subscript various data arrays to a
> time/index array
>
> Say I have data arrays : [x], [y], [z],
>
> and I have time arrays : [1pm] , [2pm], [3pm] , [4pm] etc......
>
> Right now I am simply doing this by typing:
>
> x_1pm = x[1pm]
> x_2pm=x[2pm]
>
> y_1pm=y[1pm] etc............
>
> This is very long and tedious, so I imagine (hope) there must be a better
> way.

You can either use higher-dimensional arrays (if 1pm, 2pm, 3pm
etc. all have the same length), and index them all at once, like:

times=[ [1_pm], [2_pm], [3_pm] ]
xt=x[times]
yt=y[times]

or, if they are of different length, use an array of pointers, ala:

times=ptrarr(n_times)
times[0]=ptr_new(...) ;; fill in the times pointer array

for i=0,n_elements(times)-1 do begin
xt=x[*times[i]]
yt=y[*times[i]]
;; do something with xt, yt
endfor

JD

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[Message index]

		Re: help array subscripting By: JD Smith on Mon, 26 June 2006 09:38
		Re: help array subscripting By: David Fanning on Sat, 24 June 2006 14:36
		Re: help array subscripting By: greg michael on Sat, 24 June 2006 14:32
		Re: help array subscripting By: David Fanning on Sat, 24 June 2006 13:54
		Re: help array subscripting By: greg michael on Sat, 24 June 2006 12:18

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