How to write a large matrix to a comma separated file

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I've got a huge matrix (20000 x 3000) and I want to write it to a csv file.
Until now, where the size of my matrices was 20000 x 1000 I was using the command
But now, the file1 is impossible to open.
Any ideas?
Christina on 28 Nov 2013
Hi Walter,
Thanks for the response. My system is 64 bit, yes I do have Windows and I was trying to open that file, either with Excel 2007, or with Notepad ++. Anyway, I won't continue working with that, as it takes lots of time.
Thank you for your reply anyway.

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