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Re: Would you consider this a bug? [message #13061 is a reply to message #12982]

Thu, 01 October 1998 00:00

David Kastrup
Messages: 33
Registered: February 1998

Member

Kevin Ivory <Kevin.Ivory@linmpi.mpg.de> writes:

> Leaving the bug topic - switching to algorithms
>
> David Kastrup wrote:
>> Unfortunately, translating something like
>>
>> a[[5,2,3,0,4,1]] = a
>> into the equivalent
>> a = a[[3,5,1,2,4,0]]
>> is not easy to do in the general case.
>
> Actually it is: you need a second call to sort. See example below.
>
>> some data that needed to be processed in sorted order, the results
>> needed to be rearranged in original order.
>>
>> Something like
>> s = sort(a)
>> a = a[s]
>> process(a)
> ; a[s] = a ; I still think this a dangerous thing to do.
> r = sort(s)
> a = a[r]

First, it is extremely impolite to send a copy of a followup in the
newsgroup to the original poster without marking it as such. Now I
have to type my reply all over again. Double work.

Second, I refuse to call a significantly time-consuming routine like
"sort" (O(n log n)) twice without good reason. Especially when a
simple workaround like writing
a[s] = a+0
will do the trick.

--
David Kastrup Phone: +49-234-700-5570
Email: dak@neuroinformatik.ruhr-uni-bochum.de Fax: +49-234-709-4209
Institut fï¿½r Neuroinformatik, Universitï¿½tsstr. 150, 44780 Bochum, Germany

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[Message index]

		Would you consider this a bug? By: David Kastrup on Wed, 30 September 1998 00:00
		Re: Would you consider this a bug? By: David Kastrup on Mon, 05 October 1998 00:00
		Re: Would you consider this a bug? By: muswick on Sat, 03 October 1998 00:00
		Re: Would you consider this a bug? By: Martin Schultz on Fri, 02 October 1998 00:00
		Re: Would you consider this a bug? By: David Kastrup on Thu, 01 October 1998 00:00
		Re: Would you consider this a bug? By: korpela on Thu, 01 October 1998 00:00
		Re: Would you consider this a bug? By: Kevin Ivory on Thu, 01 October 1998 00:00
		Re: Would you consider this a bug? By: David Kastrup on Thu, 01 October 1998 00:00
		Re: Would you consider this a bug? By: Kevin Ivory on Thu, 01 October 1998 00:00

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