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indexing bug? [message #92892]

Thu, 17 March 2016 22:57

Dae-Kyu Shin
Messages: 25
Registered: February 2015

Junior Member

Hi

for example

arr = indgen(3)

;; in this case, of course error occuring
print, arr[5]

;; but in this case, there is no error
print, arr[[5]]

is this bug??

Thanks

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Re: indexing bug? [message #92893 is a reply to message #92892]

Thu, 17 March 2016 23:01

Dae-Kyu Shin
Messages: 25
Registered: February 2015

Junior Member

2016년 3월 18일 금요일 오후 2시 57분 28초 UTC+9, Dae-Kyu Shin 님의 말:
> Hi
>
> for example
>
> arr = indgen(3)
>
> ;; in this case, of course error occuring
> print, arr[5]
>
> ;; but in this case, there is no error
> print, arr[[5]]
>
> is this bug??
>
> Thanks

and in this case

print, arr[[-1]]

->> result = 0
this result is not coincide my expectation.
my expectation is : print, arr[-1]

IDL 8.5.1

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Re: indexing bug? [message #92894 is a reply to message #92892]

Fri, 18 March 2016 00:49

Lajos Foldy
Messages: 176
Registered: December 2011

Senior Member

On Friday, March 18, 2016 at 6:57:28 AM UTC+1, Dae-Kyu Shin wrote:
> Hi
>
> for example
>
> arr = indgen(3)
>
> ;; in this case, of course error occuring
> print, arr[5]
>
> ;; but in this case, there is no error
> print, arr[[5]]
>
> is this bug??

No, it's a feature :-) Array subscripts are clipped, unless STRICTARRSUBS is used:

http://www.exelisvis.com/docs/using_arrays_as_array_su.html

regards,
Lajos

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Re: indexing bug? [message #92895 is a reply to message #92894]

Fri, 18 March 2016 01:01

Dae-Kyu Shin
Messages: 25
Registered: February 2015

Junior Member

2016년 3월 18일 금요일 오후 4시 49분 17초 UTC+9, fawltyl...@gmail.com 님의 말:
> On Friday, March 18, 2016 at 6:57:28 AM UTC+1, Dae-Kyu Shin wrote:
>> Hi
>>
>> for example
>>
>> arr = indgen(3)
>>
>> ;; in this case, of course error occuring
>> print, arr[5]
>>
>> ;; but in this case, there is no error
>> print, arr[[5]]
>>
>> is this bug??
>
> No, it's a feature :-) Array subscripts are clipped, unless STRICTARRSUBS is used:
>
> http://www.exelisvis.com/docs/using_arrays_as_array_su.html
>
> regards,
> Lajos

Good. Thanks Lajos

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