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Re: newbie question / concatenation of arrays of nested structure [message #17047 is a reply to message #17045]

Wed, 08 September 1999 00:00

Thomas A. McGlynn
Messages: 23
Registered: March 1996

Junior Member

If you don't want to modify the code that is creating the structures
to be concatenated then neither of these approaches might be feasible. You
could then do something like:

first = replicate({...}, ...)
....
second = replicate({...}, ...)
....

temp = replicate(first[0], n_elements(second));
for i=0, n_tags(first[0])-1 do temp.(i) = second.(i)
first = [first,temp]

This still isn't too bad, just three lines for a reasonably generic solution.

So long as the types agree you don't even have to worry about the
structure tag names matching. One could make build this into a function
easily enough -- though a general routine would probably need to deal
with recursive structures intelligently (and maybe multi-dimensional
arrays of structures).

Regards,
Tom McGlynn

Liam Gumley wrote:
>
> Liam Gumley wrote:
>> The only way to create equivalent structures is to use named structures,
>> e.g.
>>
>> IDL> record = {z, a:0, b:'name', c:0}
>> IDL> first = replicate(record, 5)
>> IDL> second = replicate(record, 3)
>> IDL> combo = [first, second]
>
> Note to self: Any time you say "The only way" in this newsgroup, you're
> bound to be wrong.
>
> David's web page correctly points out that copies of an anonymous
> structure are equivalent, and thus can be concatenated, e.g.
>
> IDL> record = {a:0, b:'name', c:{d:0, e:0}}
> IDL> a = record
> IDL> b = record
> IDL> c = [a, b]
>
> Cheers,
> Liam.
>
> --
> Liam E. Gumley
> Space Science and Engineering Center, UW-Madison
> http://cimss.ssec.wisc.edu/~gumley

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[Message index]

		Re: newbie question / concatenation of arrays of nested structure By: davidf on Thu, 09 September 1999 00:00
		Re: newbie question / concatenation of arrays of nested structure By: colinr on Thu, 09 September 1999 00:00
		Re: newbie question / concatenation of arrays of nested structure By: Thomas A. McGlynn on Wed, 08 September 1999 00:00
		Re: newbie question / concatenation of arrays of nested structure By: Liam Gumley on Wed, 08 September 1999 00:00
		Re: newbie question / concatenation of arrays of nested structure By: Liam Gumley on Wed, 08 September 1999 00:00
		Re: newbie question / concatenation of arrays of nested structure By: davidf on Wed, 08 September 1999 00:00

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