cellfun is slow for lexical sort

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

[Walter Roberson]

So to check, you would want to sort 1 then 10 to 19 then 2 and so on?

Answer 1

[Walter Roberson]

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' ?

[Preethi]

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?