Re: User selectable lower array bound?

[Martin Schultz <martin.schultz(at)dkrz.de>]

Craig Markwardt <craigmnet@cow.physics.wisc.edu> writes:
> JD Smith <jdsmith@astro.cornell.edu> writes:
> > The most annoying thing about IDL arrays to me is the need always to
> > test whether they exist or not when concatenating onto them.  The idea
> > of extending arrays in both directions would be neatly summed up by
> > allowing:
> > 
> > a=[b,a] & a=[a,b] even if a doesn't (yet) exist.  
> > 
> > Either that, or IDL needs a list type which allows such operations. 
> > Wasn't that just me ranting about special case functionality leading to
> > inconsistency?
> 
> Hmmm, agreed.  I think WMC's and my proposal was for a "null" data
> type which was essentially an empty list.
> 
> Craig

as in
   var = nularr(100) ;-)

what is N_Elements(nul_variable) ? How do you test for a keyword etc.?

Cheers,

Martin


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