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Re: How to add a new tag to N structures [message #69989 is a reply to message #69972]

Thu, 04 March 2010 04:00

R.Bauer
Messages: 1424
Registered: November 1998

Senior Member

nata schrieb:
> Hi guys,
>
> I want to add a new TAG to an array of structures. I don't know how to
> do that efficiently.
> For example, this is my array:
>
> str={a: 0l, b: ''}
> str_arr=REPLICATE(str,10)
>
> And I can't do things like this:
>
> FOR i=0, 9 DO str_arr[i]=CREATE_STRUCT(str_arr[i],'C',0l)
> or
> str_arr=CREATE_STRUCT(str_arr[i],'C',0l)
>
> This is just an example, my real structs contain a lot of fields.
>
> For some reasons I can define the C tag before so I have to add to
> each struct later. There is a way to do that without creating the new
> struct array and copying each field separately ?
> Thanks,
> nata

well you can reform your array of structures to an structure with
arrays. then you can add your new tag to that structure. Afterwards
reform it back to your array of structures

e.g.
str={a: 0l, b: ''}
str_arr=REPLICATE(str,10)

ref_str = reform_struct(str_arr, /tag_array, 10)
ref_str = create_struct(ref_str, 'c' ,make_array(10))
help, ref_str, /str
** Structure <2800d48>, 3 tags, length=240, data length=240, refs=1:
A LONG Array[10]
B STRING Array[10]
C FLOAT Array[10]

str = reform_struct(str_arr, /struct_array, 10)
help, str
STR STRUCT = -> <Anonymous> Array[10]

You get reform_struct from
http://www.fz-juelich.de/icg/icg-1/idl_icglib/idl_source/idl _html/dbase/reform_struct_dbase.pro.html

cheers
Reimar

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[Message index]

		Re: How to add a new tag to N structures By: natha on Thu, 04 March 2010 15:01
		Re: How to add a new tag to N structures By: R.Bauer on Thu, 04 March 2010 04:00
		Re: How to add a new tag to N structures By: David Fanning on Wed, 03 March 2010 11:44
		Re: How to add a new tag to N structures By: penteado on Wed, 03 March 2010 11:37
		Re: How to add a new tag to N structures By: David Fanning on Wed, 03 March 2010 11:02
		Re: How to add a new tag to N structures By: penteado on Wed, 03 March 2010 10:44
		Re: How to add a new tag to N structures By: wlandsman on Wed, 03 March 2010 10:07

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