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Re: Nested data structures [message #89919 is a reply to message #89918]

Wed, 24 December 2014 20:49

chris_torrence@NOSPAM is currently offline

chris_torrence@NOSPAM
Messages: 528
Registered: March 2007

Senior Member

On Wednesday, December 24, 2014 5:11:54 PM UTC-7, Mike Galloy wrote:
> On 12/24/14, 2:29 PM, wlandsman wrote:
>> I am trying to build a data structure that will allow me to specify a person by his State, city, street and street. (This is not my actual need, but it is analogous.) Thus I might specify (as metacode)
>>
>> ['Colorado']['Boulder']['Pearl'][9990] = 'John'
>>
>> I assume this can be done with nested hashes or dictionaries, but I am having difficulty figuring out how to start. I started writing something like
>>
>> person = [hash('colorado',['boulder','Denver'], hash('Arizona',[Tuscon','Phoenix'])
>>
>> but I get lost in making the nesting clear. thanks for any help. --Wayne
>>
>>
>
> Is something like this what you are trying to do?
>
> IDL> person = hash('Colorado', hash('Boulder', 1, 'Denver', 2),
> 'Arizona', hash('Tucson', 3, 'Phoenix', 4))
> IDL> (person['Colorado'])['Denver']
> 2
>
> Mike
> --
> Michael Galloy
> www.michaelgalloy.com
> Modern IDL: A Guide to IDL Programming (http://modernidl.idldev.com)
> Research Mathematician
> Tech-X Corporation

And to make it even more convenient, you can simply append the subscripts inside the first set of brackets and it will automatically descend into the sub-hashes:

IDL> print,person['Colorado', 'Denver']
2

Happy Holidays,
Chris

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[Message index]

		Nested data structures By: wlandsman on Wed, 24 December 2014 13:29
		Re: Nested data structures By: Michael Galloy on Wed, 24 December 2014 16:11
		Re: Nested data structures By: chris_torrence@NOSPAM on Wed, 24 December 2014 20:49
		Re: Nested data structures By: wlandsman on Fri, 26 December 2014 12:02

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