cellfun is slow for lexical sort

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Preethi
Preethi on 3 Oct 2013
Commented: Preethi on 4 Oct 2013
Hi,
I am trying to lexicogrphically sort a matrix (size - 10000x 1) and i used cellfun, but it is very time consuming. Is there any way to speed up. I tried using for loop but i couldn't get the correct result. My code is
im_dct_num = num2cell(im_dct);
im_dct_temp = cellfun(@num2str,im_dct_num,'UniformOutput',false);
Thanking you in advance
Regards,
Preethi
  1 Comment
Walter Roberson
Walter Roberson on 3 Oct 2013
So to check, you would want to sort 1 then 10 to 19 then 2 and so on?

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Accepted Answer

Walter Roberson
Walter Roberson on 3 Oct 2013
You should find it faster to use
im_dct_temp = cellstr( num2str( im_dct(:) ) );
but then you need to decide about treating leading or trailing blanks. For example how should
2.00000000
sort relative to
2
? And would your preferred output for 2 be '2' or '2.' or '2.0' ?
  1 Comment
Preethi
Preethi on 4 Oct 2013
It is working, speed has improved. If I have to use it for a matrix (ex. 19000 x 64) how do I modify the code?

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