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Re: Sorting a matrix [message #83489 is a reply to message #83434]

Thu, 07 March 2013 16:34

Jeremy Bailin
Messages: 618
Registered: April 2008

Senior Member

On 3/7/13 7:32 AM, Mats Lï¿½fdahl wrote:
> Den onsdagen den 6:e mars 2013 kl. 06:22:01 UTC+1 skrev Jeremy Bailin:
>>> Oh, this looks pretty clever. I think I understand the idea but I'll have to digest the details. If I'm right, you find out for each column how many different values there are and then multiply the index for that column with the proper number to avoid overlap with the other column indices when adding.
>>
>> Yes, that's exactly right!
>
> OK, good. But I have problems with the ord() function. When called with an array of only zeros, the call to histogram() does not work:
>
> HISTOGRAM: Expression must be an array in this context: UNIQVALUES.
> % Execution halted at: ORD 14
>
> Where line 14 is
>
> h = histogram(uniqvalues,bin=1,min=0,reverse=ri)
>
> The reason is that when there is only one value, uniqvalues has only one element and is therefore turned into is a scalar.
>
> The call to histogram works if I chance it to
>
> h = histogram([uniqvalues],bin=1,min=0,reverse=ri)
>
> Could this have bad consequences in other cases or is this what I should do? You described the ord() code you gave as a stub. Does this mean there is a more complete version that maybe checks for this problem (and other problems as well)?
>

Ah, interesting! No, I didn't check for that - the code is actually
complete, it's just that the documentation is missing because I didn't
want to obscure the post. ;-)

Thanks for the bugfix!

-Jeremy.

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[Message index]

		Sorting a matrix By: Mats Löfdahl on Fri, 01 March 2013 04:45
		Re: Sorting a matrix By: Mats Löfdahl on Fri, 01 March 2013 08:49
		Re: Sorting a matrix By: Jeremy Bailin on Tue, 05 March 2013 21:22
		Re: Sorting a matrix By: Jeremy Bailin on Fri, 01 March 2013 08:28
		Re: Sorting a matrix By: Mats Löfdahl on Thu, 07 March 2013 05:32
		Re: Sorting a matrix By: Jeremy Bailin on Thu, 07 March 2013 16:34
		Re: Sorting a matrix By: Mats Löfdahl on Fri, 08 March 2013 16:14
		Re: Sorting a matrix By: cgguido on Fri, 08 March 2013 16:24
		Re: Sorting a matrix By: cgguido on Fri, 08 March 2013 14:24
		Re: Sorting a matrix By: Jeremy Bailin on Fri, 08 March 2013 15:51
		Re: Sorting a matrix By: Mats Löfdahl on Fri, 08 March 2013 16:31

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