| Re: use of loops in IDL for hashtable [message #67893] |
Mon, 07 September 2009 20:35 |
b.a
Messages: 26
Registered: July 2009
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Junior Member |
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On Sep 8, 12:36 pm, pp <pp.pente...@gmail.com> wrote:
> On Sep 7, 11:16 pm, "b.a" <u4565...@anu.edu.au> wrote:
>
>
>
>
>
>> 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.
>
> KEYS() returns an array of key names. So you loop over the elements of
> this array. Something like:
>
> colorkeys=colorList->keys()
> for i=0,n_elements(colorkeys)-1 do if fileList->iscontained(colorkeys
> [i]) then *do stuff*- Hide quoted text -
>
> - Show quoted text -
Thanks a lot!
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| Re: use of loops in IDL for hashtable [message #67894 is a reply to message #67893] |
Mon, 07 September 2009 19:36  |
penteado
Messages: 866
Registered: February 2018
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Senior Member
Administrator |
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On Sep 7, 11:16 pm, "b.a" <u4565...@anu.edu.au> wrote:
> 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.
KEYS() returns an array of key names. So you loop over the elements of
this array. Something like:
colorkeys=colorList->keys()
for i=0,n_elements(colorkeys)-1 do if fileList->iscontained(colorkeys
[i]) then *do stuff*
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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
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Junior Member |
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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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| Re: use of loops in IDL for hashtable [message #67904 is a reply to message #67895] |
Mon, 07 September 2009 01:08 |
Wout De Nolf
Messages: 194
Registered: October 2008
|
Senior Member |
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On Sun, 6 Sep 2009 19:01:06 -0700 (PDT), "b.a" <u4565723@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).
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