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Re: Ordered index array [message #45432 is a reply to message #45431]

Thu, 08 September 2005 01:48

Emmanuel Christophe is currently offline

Emmanuel Christophe
Messages: 11
Registered: March 2004

Junior Member

Sorry, my example was confusing:

if the input is
[2,2,2,2,2,2,2,2,2,5,8]
I would like an output like
[1,1,1,1,1,1,1,1,1,2,3]

The property that should be verified is the n-th symbol of the output is
either
- the same as one between 0 and (n-1)th position
- equal to max(output[0:n-1])+1

and output[0]=1

I thought also about using the reverse_indices of the histogram
function, but as it doesn't preserve the order, I'm not sure it would work.

Thanks,
Emmanuel

David Fanning a écrit :
> David Fanning writes:
>
>
>> How about this:
>>
>> PRO TEST
>> a = [3,6,2,1,2,7,1,1]
>> h = Histogram(a, Reverse_Indices=ri, Min=0)
>> b = Indgen(N_Elements(h)) + 1
>> c = Intarr(N_Elements(h))
>> FOR j=0,N_Elements(h)-1 DO BEGIN
>> IF ri[j+1] NE ri[j] THEN $
>> c[ri[ri[j]:ri[j+1]-1]] = Min(b[ri[ri[j]:ri[j+1]-1]])
>> ENDFOR
>> Print, c
>> END
>>
>> 1 2 3 4 3 6 4 4
>>
>> Note that your original example is wrong. :-)
>
>
> Whoops! *I* didn't use the original example either (although
> yours is still wrong!).
>
> Here is a more complete solution, using the original data:
>
> PRO TEST
> a = [3,6,2,1,2,8,1,1]
> h = Histogram(a, Reverse_Indices=ri, Min=0)
> b = Indgen(N_Elements(h)) + 1
> c = Intarr(N_Elements(h))
> FOR j=0,N_Elements(h)-1 DO BEGIN
> IF ri[j+1] NE ri[j] THEN $
> c[ri[ri[j]:ri[j+1]-1]] = Min(b[ri[ri[j]:ri[j+1]-1]])
> ENDFOR
> Print, c[0:N_Elements(a)-1]
> END
>
> Cheers,
>
> David
>
>

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[Message index]

		Re: Ordered index array By: Emmanuel Christophe on Thu, 08 September 2005 07:51
		Re: Ordered index array By: David Fanning on Thu, 08 September 2005 06:55
		Re: Ordered index array By: Paolo Grigis on Thu, 08 September 2005 06:51
		Re: Ordered index array By: David Fanning on Thu, 08 September 2005 06:08
		Re: Ordered index array By: David Fanning on Thu, 08 September 2005 06:02
		Re: Ordered index array By: Paolo Grigis on Thu, 08 September 2005 05:30
		Re: Ordered index array By: Paolo Grigis on Thu, 08 September 2005 03:03
		Re: Ordered index array By: Emmanuel Christophe on Thu, 08 September 2005 01:58
		Re: Ordered index array By: Emmanuel Christophe on Thu, 08 September 2005 01:48
		Re: Ordered index array By: Paolo Grigis on Thu, 08 September 2005 01:22
		Re: Ordered index array By: David Fanning on Wed, 07 September 2005 10:17
		Re: Ordered index array By: David Fanning on Wed, 07 September 2005 10:01

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