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Re: The limits of !NULL [message #83937] Wed, 17 April 2013 20:43
Craig Markwardt is currently offline  Craig Markwardt
Messages: 1869
Registered: November 1996
Senior Member
On Wednesday, April 17, 2013 10:52:42 PM UTC-4, Jeremy Bailin wrote:
> Having only recently started switching to IDL8 thinking, I decided today
> to try out the WHERE(/NULL) functionality. And the first thing I tried
> to do failed miserably.
...
> IDL> data1[a] = -data1[a]
>
> % Variable is undefined: <UNDEFINED>.
...
> But even if the RHS is implicit, it fails:
>
> IDL> data1[a]++

<headslap>

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