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Re: buggy dictionary [message #91138 is a reply to message #91131]

Mon, 08 June 2015 11:28

Dick Jackson
Messages: 347
Registered: August 1998

Senior Member

On Monday, 8 June 2015 07:49:14 UTC-7, Fabien wrote:
> On 06/08/2015 04:15 PM, Helder wrote:
>> Please save everything before trying it!
>>
>> IDL> a = dictionary('b',dictionary('c',findgen(10)))
>> IDL> a.b['c',1:-1]
>>
>> ... bye bye IDL
>
> Nice! Crashes IDL on my 64b Linux machine, too.
>
> Cheers,
>
> Fabien

I found some slightly different results:

IDL> !version
{
"ARCH": "x86_64",
"OS": "Win32",
"OS_FAMILY": "Windows",
"OS_NAME": "MicrosoftWindows",
"RELEASE": "8.4",
"BUILD_DATE": "Sep272014",
"MEMORY_BITS": 64,
"FILE_OFFSET_BITS": 64
}

IDL> a = dictionary('b',dictionary('c',findgen(10)))

IDL> a.b['c',[1:-1]]
1.0000000 0.00000000 0.00000000
;; Mine does not fail like yours, but it seems wrong!
;; That looks like array indexing off the low end, filling in '0' as it reaches back to -1

;; This seems to get to what you want, I think!:
IDL> a.b.c[1:-1]
1.0000000 2.0000000 3.0000000 4.0000000 5.0000000 6.0000000
7.0000000 8.0000000 9.0000000
;; But maybe you want the 'c' to be a string, to change it programmatically, in which case:
IDL> (a.b['c'])[1:-1]
1.0000000 2.0000000 3.0000000 4.0000000 5.0000000 6.0000000
7.0000000 8.0000000 9.0000000
;; I believe the parentheses cause a temporary copy of the array(10) to be made, which may not be OK in your application

;; I wondered about modifying values in there, doesn't look good:
IDL> a.b.c[1:-1]=42
% Attempt to store into an expression: Structure reference.
% Execution halted at: $MAIN$
IDL> help,a.b.c[1:-1]
<Expression> FLOAT = Array[9]

;; I would think that should work, too:
IDL> c=findgen(10)
IDL> c[1:-1]=42
IDL> c
0.00000000 42.000000 42.000000 42.000000 42.000000 42.000000
42.000000 42.000000 42.000000 42.000000

Is anyone from {Harr|Exel}|is taking notes from this? Chris, are you there? :-)

Cheers,
-Dick

Dick Jackson Software Consulting Inc.
Victoria, BC, Canada --- http://www.d-jackson.com

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[Message index]

		buggy dictionary By: Helder Marchetto on Mon, 08 June 2015 07:08
		Re: buggy dictionary By: Helder Marchetto on Mon, 08 June 2015 07:15
		Re: buggy dictionary By: Fabzi on Mon, 08 June 2015 07:49
		Re: buggy dictionary By: dg86 on Mon, 08 June 2015 08:12
		Re: buggy dictionary By: Helder Marchetto on Mon, 08 June 2015 08:22
		Re: buggy dictionary By: dg86 on Mon, 08 June 2015 09:28
		Re: buggy dictionary By: Dick Jackson on Mon, 08 June 2015 11:28
		Re: buggy dictionary By: Helder Marchetto on Mon, 08 June 2015 13:30
		Re: buggy dictionary By: Helder Marchetto on Tue, 09 June 2015 02:32
		Re: buggy dictionary By: Lajos Foldy on Tue, 09 June 2015 04:01
		Re: buggy dictionary By: Dick Jackson on Tue, 09 June 2015 09:10
		Re: buggy dictionary By: Dick Jackson on Tue, 09 June 2015 09:15
		Re: buggy dictionary By: chris_torrence@NOSPAM on Tue, 09 June 2015 11:21

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