| keyword_set([0]) [message #48085] |
Mon, 20 March 2006 10:04 |
vlk.astro
Messages: 11
Registered: March 2006
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Junior Member |
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Hello,
We are finally being forced to migrate from 5.3 to 6.2, and
somewhere along the way IDL has bowled a googly with
keyword_set.
With 5.3, an array [0] was recognized as having been set:
IDL> print, !version
{ sparc sunos unix 5.3 Nov 11 1999}
IDL> a=0 & b=[a] & print, keyword_set(a), keyword_set(b)
0 1
IDL> a=1 & b=[a] & print, keyword_set(a), keyword_set(b)
1 1
With 6.2, 0 and [0] are indistinguishable:
IDL> print, !version
{ sparc sunos unix Solaris 6.2 Jun 20 2005 64 64}
IDL> a=0 & b=[a] & print, keyword_set(a), keyword_set(b)
0 0
IDL> a=1 & b=[a] & print, keyword_set(a), keyword_set(b)
1 1
Now, I am not one to rail against progress, especially when
the new behavior matches the documentation. But nevertheles,
it is damned inconvenient, because I think I have around a
hundred off procedures that depended on the 0/[0] dichotomy.
My question : is there a simple way to replace the old calls to
keyword_set() with one- or two-liners that will work in both 5.3
and 6.2 and one that will know the difference between a scalar 0
and a vector 0? I don't want to roll my own function because of
issues of speed (some of the keyword_set's are deeply nested,
and I'd rather not have the extra overhead of a new function call)
and aesthetics (i.e., as much native functionality as possible).
Right now all I have is an ugly concoction that involves size(),
n_elements() _and_ keyword_set().
Thanks,
Vinay
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