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Re: !NULL in IDL 7.1 vs. 8.0 [message #94313 is a reply to message #79247]

Thu, 06 April 2017 01:39

zhangchengxin2011
Messages: 1
Registered: April 2017

Junior Member

On Thursday, 9 February 2012 06:08:33 UTC+8, Paulo Penteado wrote:
> !null was introduced in IDL 8.0. So, no surprises there.
>
> On Feb 8, 7:33 pm, TonyLanz <tolan...@gmail.com> wrote:
>> Hey all,
>> I'm debugging some IDL code and I noticed some odd behavior with the
>> system variable !NULL in IDL 7.1, curious if others had seen this....I
>> suspect it's a bug and I can avoid it in IDL 8.
>>
>> In IDL 7.1 if I do a
>>
>> IDL>print,!NULL
>>
>> I get % Not a legal system variable: !NULL.
>>
>> In IDL 8 it properly returns !NULL. Have others observed this?
>>
>> Tony

Do you know how to use "!null" without error in IDL 7.1? Since an IDL library uses '!null', however my working environment is IDL 7.1

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[Message index]

		Re: !NULL in IDL 7.1 vs. 8.0 By: penteado on Wed, 08 February 2012 14:08
		Re: !NULL in IDL 7.1 vs. 8.0 By: zhangchengxin2011 on Thu, 06 April 2017 01:39
		Re: !NULL in IDL 7.1 vs. 8.0 By: wlandsman on Thu, 06 April 2017 12:09

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