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Re: Broken hash init() [message #73182]

Wed, 27 October 2010 16:18

penteado
Messages: 866
Registered: February 2018

Senior Member
Administrator

On Oct 27, 8:57 pm, Paulo Penteado <pp.pente...@gmail.com> wrote:
> I just noticed that the init method is not properly creating hashes
> from structures on some situations:
>
> IDL> a={b:list(1,2)}
> IDL> print,a
> {<ObjHeapVar1(LIST)>}
> IDL> print,a.b
> 1
> 2
> IDL> h=hash(a)
> IDL> print,h
> B: 1
>
> Or,
>
> IDL> a={b:[1,2]}
> IDL> print,a
> { 1 2}
>
> IDL> h=hash(a)
> IDL> print,h
> B: 1
>
> But this works:
>
> IDL> a={b:9,c:[5,8]}
> IDL> print,a
> { 9 5 8}
>
> IDL> h=hash(a)
> IDL> print,h
> B: 9
> C: 5 8

Trying to get around that problem, I encountered the same problem
because I forgot about the bug with foreach on string arrays. So
perhaps that is also causing the problem with hash::init():

IDL> a={a:[1,2]}
IDL> h=hash()
IDL> foreach tag,tag_names(a),i do h[tag]=a.(i)
IDL> print,h
A: 1

Using a for loop instead of the foreach, it works normally:

IDL> tn=tag_names(a)
IDL> for i=0,n_elements(tn)-1 do h[tn[i]]=a.(i)
IDL> print,h
A: 1 2

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		Re: Broken hash init() By: penteado on Wed, 27 October 2010 16:18
		Re: Broken hash init() By: penteado on Thu, 28 October 2010 16:49

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