Out of memory error in BWT encoder code

Hi guys

I tried to use BTW encoder from following link: http://www.mathworks.com.au/matlabcentral/fileexchange/4904-bwt-encoder-and-decoder/content/bwt_matlab_code/bwtenc.m

But when I send it a .pdf file of article for example 20 pages or more,I get following error:

Out of memory. Type HELP MEMORY for your options.

Error in bwtenc (line 32) to_sort=zeros(length(a),length(a),'int32');

Do you have any suggestion to improve the BWT code?

Regards Mojgan

Answer 1

[David Sanchez]

The BTW is designed for .txt files, not .pdf. I'm not an expert in .pdf encryption, but I think it's quite different from .txt's.

[Mojgan]

It doesn't matter.I can convert it to .txt

It works with both of them but the problem is that when the file is big,it can't manage the memory