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Re: Simple question in IDL, looking for solution, thank you [message #81758]

Mon, 22 October 2012 14:37

Danxia
Messages: 10
Registered: September 2012

Junior Member

Hey Jeremy,

I haven't read this before, but this is deadly helpful. Thanks a lot.

Danxia
On Monday, October 22, 2012 2:10:16 PM UTC-4, Jeremy Bailin wrote:
> On 10/22/12 7:55 AM, Heinz Stege wrote:
>
>> Hi Danxia,
>
>>
>
>> you didn't ask for a solution without a loop. So here is my simple
>
>> answer:
>
>>
>
>> arr=[5,2,3,1,8,3,1,2,3]
>
>> bcg=[1,2,3,2,1,4,2,3,5]
>
>> sum=intarr(max(arr)+1)
>
>> for i=0,n_elements(bcg)-1 do sum[arr[i]]+=bcg[i]
>
>> print,sum[1:*]
>
>>
>
>> Cheers, Heinz
>
>>
>
>
>
> And of course, if you need a very efficient implementation of this (i.e.
>
> if your arrays have millions of elements), then read the "chunk
>
> indexing" section of JD's HISTOGRAM tutorial
>
> http://www.idlcoyote.com/tips/histogram_tutorial.html (you HAVE read
>
> JD's HISTOGRAM tutorial, right???)
>
>
>
> -Jeremy.

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[Message index]

		Re: Simple question in IDL, looking for solution, thank you By: Danxia on Mon, 22 October 2012 14:37
		Re: Simple question in IDL, looking for solution, thank you By: Danxia on Mon, 22 October 2012 14:36
		Re: Simple question in IDL, looking for solution, thank you By: Jeremy Bailin on Mon, 22 October 2012 11:10
		Re: Simple question in IDL, looking for solution, thank you By: Heinz Stege on Mon, 22 October 2012 04:55
		Re: Simple question in IDL, looking for solution, thank you By: Heinz Stege on Tue, 23 October 2012 11:07

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