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Re: use of loops in IDL for hashtable [message #67895 is a reply to message #67894]

Mon, 07 September 2009 19:16

b.a
Messages: 26
Registered: July 2009

Junior Member

On Sep 7, 6:08 pm, Wox <s...@nomail.com> wrote:
> On Sun, 6 Sep 2009 19:01:06 -0700 (PDT), "b.a" <u4565...@anu.edu.au>
> wrote:
>
>> Hi,
>
>> I have 2 hashtables in my IDL program. one is called fileList which
>> has ( id , data ) as its (key, value) and second one is colorList
>> ( id , color ). I want to define a "foreach" loop so that for each id
>> of colorList which exists in fileList, it plots the data with the
>> "color". I mean for each string "id" get the "data" from fileList and
>> get the "color" from colorList and plot the data in that colour.
>
>> Can anybody help me with this please.
>
>> Thank you
>
> Are you using Craig Markwardt's hash table object? This object has a
> method "KEYS" which returns all existing keys in a hash table, so you
> can loop over all keys in colorList (or fileList), use "ISCONTAINED"
> to check whether the key is in fileList (or colorList) and do your
> plotting when it is (employing the Get method to get data and color).

Thanks for your reply.
Yes, I am using Craig Markwardt's hash table object. The problem with
using KEY() is that the keys are not like {1, 2, 3, 4, ...} that I can
loop over them. they are like {76, 65, 90, 2, 503, ...}. and I don't
know the largest key. I have to say for i=0 till some number, go i+1
and if i+1 is contained in the keys, return its value and rest of the
things. but I can't specify that "some number". So I think I have to
use "for each" loop. But I don't know the syntax for it in my case.

Cheers

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[Message index]

		Re: use of loops in IDL for hashtable By: b.a on Mon, 07 September 2009 20:35
		Re: use of loops in IDL for hashtable By: penteado on Mon, 07 September 2009 19:36
		Re: use of loops in IDL for hashtable By: b.a on Mon, 07 September 2009 19:16
		Re: use of loops in IDL for hashtable By: Wout De Nolf on Mon, 07 September 2009 01:08

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