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Re: structures still confusing [message #49077 is a reply to message #49073]

Tue, 13 June 2006 01:13

Allan Whiteford
Messages: 117
Registered: June 2006

Senior Member

Martin,

print,(s.m)[0]

is probably less confusing. Similarly you can do:

print,(s.m)[0,1]

but you can't do:

print,s.m[0,1]

or, you can also do:

print,(s.m[0])[1]

Thanks,

Allan

Martin Rother wrote:
> Hi Gurus,
>
> finally something, where I don't know,
> if it's odd idl syntax or not...
>
> something about structures.
>
> FUNCTION test_struct
>
> s = [{ m : [1L, 2L, 3L], n :1L }]
>
> FOR i = 1L, 2L DO BEGIN
> ;
> s = [s, { m : [1L, 2L, 3L], n : i }]
> ;
> ENDFOR
>
> return, s
>
> END
>
> this creates an array of structures:
>
> (X). s = test_struct()
> (X). help,/struct,s
> ** Structure <fa330>, 2 tags, length=16, data length=16, refs=1:
> M LONG Array[3]
> N LONG 1
> (X). print, n_elements(s)
> 3
> (X).
>
> so far ok, I guess. but
>
> (X). help,s.m
> <Expression> LONG = Array[3, 3]
> (X). print, s.m
> 1 2 3
> 1 2 3
> 1 2 3
> (X). print, s.m[0]
> 1 1 1
> (X). print, s.m[1]
> 2 2 2
> (X). print, s.m[2]
> 3 3 3
>
> is a *bit* confusing. isn't it?
>
>
> best regards,
> martin.

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[Message index]

		Re: structures still confusing By: JD Smith on Tue, 13 June 2006 09:33
		Re: structures still confusing By: rother on Tue, 13 June 2006 08:45
		Re: structures still confusing By: btt on Tue, 13 June 2006 07:54
		Re: structures still confusing By: Allan Whiteford on Tue, 13 June 2006 01:13
		Re: structures still confusing By: Mark Hadfield on Mon, 12 June 2006 18:42

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