| Re: Expanding array with counts from another array [message #51508] |
Thu, 23 November 2006 11:18 |
G. Lichtenberg
Messages: 2
Registered: November 2006
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Junior Member |
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David Fanning wrote:
>> I am pretty sure that a solution was probably posted ages ago already,
>> but could not find it yet. Pointers to a solution are appreciated.
>
> http://www.dfanning.com/idl_way/chunkindex.html
>
> Cheers,
>
> David
Sigh -
I knew it could be found somewhere. If I only had known that I wanted
to 'chunk index' the data - well that's the risk of not being a native
speaker. Anyway, thanks a lot for this tip and the many others I 'stole'
from the various archives.
Slightly embarrassed
gl
--
G. Lichtenberg
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| Re: Expanding array with counts from another array [message #51517 is a reply to message #51508] |
Thu, 23 November 2006 07:23  |
David Fanning
Messages: 11724
Registered: August 2001
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Senior Member |
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Guenter Lichtenberg writes:
> I have a the following problem:
> I have two vectors, V with occurring values and C with the number of times
> the values occur (both in the correct order and V sorted). I know want to
> create an expanded array that contains for each element of V C copies
> (loopless if possible). Let's say
>
> V = [3,10,666]
> C = [1,2,3]
> =>
> R = [3,10,10,666,666,666]
>
> (For those who are interested: I use V and C to store a much larger array in
> a compact way, but have to expand it again to assign the correct counts to
> individual detector pixels - if that makes any sense to you. And I have of
> course not three but tens of thousands of values)
>
> I am pretty sure that a solution was probably posted ages ago already, but
> could not find it yet. Pointers to a solution are appreciated.
http://www.dfanning.com/idl_way/chunkindex.html
Cheers,
David
--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Sepore ma de ni thui. ("Perhaps thou speakest truth.")
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