| Nested data structures [message #89916] |
Wed, 24 December 2014 13:29  |
wlandsman
Messages: 743
Registered: June 2000
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Senior Member |
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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
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| Re: Nested data structures [message #89918 is a reply to message #89916] |
Wed, 24 December 2014 16:11  |
Michael Galloy
Messages: 1114
Registered: April 2006
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Senior Member |
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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
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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
Messages: 528
Registered: March 2007
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Senior Member |
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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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| Re: Nested data structures [message #89920 is a reply to message #89918] |
Fri, 26 December 2014 12:02 |
wlandsman
Messages: 743
Registered: June 2000
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Senior Member |
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Thanks Mike and Chris for pointing me in the right direction.
I want to build the data structure one step at a time, and it took me a while to figure out how to add new cities, but concatenation works nicely. --Wayne
IDL> person['Colorado'] += hash('FtCollins',5)
IDL> person
{
"Colorado": {
"Boulder": 1,
"FtCollins": 5,
"Denver": 2
},
"Arizona": {
"Tucson": 3,
"Phoenix": 4
}
}
On Wednesday, December 24, 2014 7:11:54 PM UTC-5, 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
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