Re: Array of objects

Hi Daniel,

At this point, I don't think we will do anything that is backwards incompatible with the description I have given you, except (perhaps -- might not make it for 6.0.0) for defining different behavior for "lifo" and "fifo" lists, that will affect the order of insertion and/or removal of list elements. We will definitely have a way to keep track of the current number of elements, plus the syntax for creating multi-element lists with a single line of code. This will still be considered a beta-level feature in 6.0.0.

 -dave

On Jan 28, 2011, at 8:58 AM, <Daniel.Leuenberger@meteoswiss.ch> wrote:

> Hi Dave,
>
> Thanks a lot for this information. Such a list is exactly what I was
> looking for, and if it gets even better in version 6.0.0, perfect! Will
> the basic syntax stay the same? Could you provide me with the
> information about what will change in 6.0.0?
>
> I will try out the list for my application and will let you know.
>
> Best regards
> Daniel
> ________________________________________
>
> Daniel Leuenberger
> Numerical Models
>
> Federal Departement of Home Affairs FDHA Federal Office of Meteorology
> and Climatology MeteoSwiss
>
> Kraehbuehlstrasse 58, P.O. Box 514, CH-8044 Zurich, Switzerland
>
> Tel. +41 44 256 97 10
> Fax +41 44 256 92 78
> daniel.leuenberger@meteoswiss.ch
> www.meteoswiss.ch - First-hand information
>
>
>> -----Original Message-----
>> From: David Brown [mailto:dbrown@ucar.edu]
>> Sent: Donnerstag, 27. Januar 2011 23:50
>> To: Leuenberger Daniel
>> Cc: ncl-talk@ucar.edu
>> Subject: Re: Array of objects
>>
>> Hi Daniel,
>>
>> There are some undocumented capabilities in NCL 5.2.1 for
>> doing some of things you are looking for. In 6.0.0 there will
>> be additional capabilities. I am attaching a small script
>> that shows what you can do now. Note that a major hole in the
>> functionality is a way to get a count of the number of
>> elements in the list without keeping an independent count.
>> That should be available in 6.0.0, along with syntax for
>> creating a list from literal elements (i.e., given variables,
>> any type, create a list l):
>>
>> l = [/ a, b, c /]
>>
>> Briefly, the routines available now are:
>>
>> functions:
>> l = NewList(listtype : string) ; valid types are "cat",
>> "join" (both specific to file lists -- at least for now),
>> "fifo" (first in first out), and "lifo" (last in first out)
>> v = ListPop(l) ; removes and returns an element from the list
>> s2 = ListGetType(l) ; returns a string array of length two :
>> (0) "cat" or "join" (1) "fifo" or "lifo"
>>
>> procedures:
>>
>> ListPush(l, var_or_value)
>> ListSetType(l, listtype : string) ; only accepts a single
>> string, not an array.
>>
>> As far as I can tell the "lifo" and "fifo" options do not
>> seem to do anything currently, and of course "cat" and "join"
>> seem kind of meaningless for heterogeneous lists.
>>
>> These are undocumented because as you can see they are not
>> all completely defined, and some aspects of their behavior
>> may change.
>> But we would be happy for you to try out what is available
>> and please make suggestions.
>>
>> -dave
>>
> _______________________________________________
> ncl-talk mailing list
> List instructions, subscriber options, unsubscribe:
> http://mailman.ucar.edu/mailman/listinfo/ncl-talk

_______________________________________________
ncl-talk mailing list
List instructions, subscriber options, unsubscribe:
http://mailman.ucar.edu/mailman/listinfo/ncl-talk
Received on Fri Jan 28 12:01:11 2011