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basic array-structure understanding question [message #63682]

Wed, 19 November 2008 06:21

julia.walterspiel
Messages: 35
Registered: July 2008

Member

hi everybody

This is what does not get into my head:

I have one array containing my data.
I have a second array containing the times when the data was
collected.
They have the same lenght.

I put them into one structure because we all like structures and I
learned about their advantages.

now:

IN SHORT are those arrays linked somehow? in other words: when working
with a structure, does IDL know which value matches the corresponding
date, given the data and the date array have the same length. Are
those arrays somehow connected or are they completely independent from
each other?

IN LONG: if I want to get e.g. all the data from all Januarys from
2000 to 2007, can I do it somehow like

all_jan = structure.data (where(structure.time EQ 200?01??????) )..
then it would automatically "select" only the right values. (and then
I would have to make a separate array of the corresponding dates, make
those two new arrays a structure so that I can plot data vs. date all
in one?)

or do I have to do it via some indexing, like:
all_jan = where (structure.time EQ 200?01??????) )

and then apply the index to my array of data?

jeez, i'm real slow on the uptake here.. sorry for bothering you with
such simple questions, but can anybody help me undo this big knot in
my brain?
cheers,
juls

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[Message index]

		basic array-structure understanding question By: julia.walterspiel on Wed, 19 November 2008 06:21
		Re: basic array-structure understanding question By: julia.walterspiel on Thu, 20 November 2008 01:38
		Re: basic array-structure understanding question By: pgrigis on Thu, 20 November 2008 06:43
		Re: basic array-structure understanding question By: R.Bauer on Thu, 20 November 2008 01:12
		Re: basic array-structure understanding question By: julia.walterspiel on Thu, 20 November 2008 01:02
		Re: basic array-structure understanding question By: R.Bauer on Thu, 20 November 2008 00:46
		Re: basic array-structure understanding question By: julia.walterspiel on Thu, 20 November 2008 00:13
		Re: basic array-structure understanding question By: Kenneth P. Bowman on Wed, 19 November 2008 07:10
		Re: basic array-structure understanding question By: julia.walterspiel on Thu, 20 November 2008 07:49
		Re: basic array-structure understanding question By: David Fanning on Thu, 20 November 2008 06:00

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