| Re: create_struct problem [message #34339] |
Wed, 05 March 2003 06:34 |
Wayne Landsman
Messages: 117
Registered: January 1997
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Senior Member |
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>
> This new tag-name prohibition might have subtle effects. For example,
> I think MRDFITS reads a FITS table into a structure with fields named
> according to the FITS column name. If the column is named 'FOR' or
> 'BEGIN', then you are sunk?
MRDFITS checks that the table name is not one of 35 reserved IDL names. If
it is, then a '_' is prepended to the structure name tag (e.g. "_CASE").
If I remember correctly, the names that caused the most problems were the
comparison operators (e.g. 'LE') which were the most likely to be a FITS
table column name.
--Wayne Landsman
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| Re: create_struct problem [message #34341 is a reply to message #34339] |
Wed, 05 March 2003 00:58  |
Craig Markwardt
Messages: 1869
Registered: November 1996
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Senior Member |
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David Fanning <david@dfanning.com> writes:
> Reimar Bauer (R.Bauer@fz-juelich.de) writes:
>
>> where is described this behaviour in idl5.6
>>
>> x=create_struct('case',1)
>> % CREATE_STRUCT: Illegal tag name: case.
>> % Execution halted at: $MAIN$
>>
>>
>> in 5.5 it was no problem
>>
>> It looks like no controll statement works
>
> Well, hooray! It looks like the sheriff is
> finally going to enforce the reserved word
> prohibition. Guess we will all have to clean
> up our language or end up in the slammer. :-)
This, I have no problem with. Creating a structure with a reserved
word is almost like creating a structure that can't be used.
It's nowhere like ATAN which had a working behavior before the sheriff
changed it :-)
This new tag-name prohibition might have subtle effects. For example,
I think MRDFITS reads a FITS table into a structure with fields named
according to the FITS column name. If the column is named 'FOR' or
'BEGIN', then you are sunk?
Craig
--
------------------------------------------------------------ --------------
Craig B. Markwardt, Ph.D. EMAIL: craigmnet@cow.physics.wisc.edu
Astrophysics, IDL, Finance, Derivatives | Remove "net" for better response
------------------------------------------------------------ --------------
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| Re: create_struct problem [message #34346 is a reply to message #34344] |
Tue, 04 March 2003 11:49 |
R.Bauer
Messages: 1424
Registered: November 1998
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Senior Member |
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David Fanning wrote:
> Reimar Bauer (R.Bauer@fz-juelich.de) writes:
>
>> where is described this behaviour in idl5.6
>>
>> x=create_struct('case',1)
>> % CREATE_STRUCT: Illegal tag name: case.
>> % Execution halted at: $MAIN$
>>
>>
>> in 5.5 it was no problem
>>
>> It looks like no controll statement works
>
> Well, hooray! It looks like the sheriff is
> finally going to enforce the reserved word
> prohibition. Guess we will all have to clean
> up our language or end up in the slammer. :-)
Ouch!
Why is such a change not announced a version before.
But it is not as bad as i thougt before.
case is forbidden cases is permitted.
cheers
Reimar
>
> Cheers,
>
> David
>
> Cheers,
>
> David
--
Forschungszentrum Juelich
email: R.Bauer@fz-juelich.de
http://www.fz-juelich.de/icg/icg-i/
============================================================ ======
a IDL library at ForschungsZentrum Juelich
http://www.fz-juelich.de/icg/icg-i/idl_icglib/idl_lib_intro. html
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| Re: create_struct problem [message #34347 is a reply to message #34346] |
Tue, 04 March 2003 09:58 |
David Fanning
Messages: 11724
Registered: August 2001
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Senior Member |
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Reimar Bauer (R.Bauer@fz-juelich.de) writes:
> where is described this behaviour in idl5.6
>
> x=create_struct('case',1)
> % CREATE_STRUCT: Illegal tag name: case.
> % Execution halted at: $MAIN$
>
>
> in 5.5 it was no problem
>
> It looks like no controll statement works
Well, hooray! It looks like the sheriff is
finally going to enforce the reserved word
prohibition. Guess we will all have to clean
up our language or end up in the slammer. :-)
Cheers,
David
Cheers,
David
--
David W. Fanning, Ph.D.
Fanning Software Consulting, Inc.
Phone: 970-221-0438, E-mail: david@dfanning.com
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Toll-Free IDL Book Orders: 1-888-461-0155
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