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list manipulation [message #78806]

Sat, 17 December 2011 11:59

greg.addr
Messages: 160
Registered: May 2007

Senior Member

I'm new at using lists, so there's probably an obvious answer here, but I couldn't figure it out. I made a list containing short, variable length arrays of integers:

IDL> print,a
1 2 3
2
3 4

I'd like to find out where the individual occurrences of, say, '2' are in the list. 'where' won't do the job...

IDL> print,where(a eq 2)
1

So I thought I probably need to flatten the list first to get [1,2,3,2,3,4] and then apply 'where'. The toArray() method doesn't seem to like the variable length elements, and 'reform' is not much interested in lists. Is there a common way to do this?

cheers,
Greg

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