Date: Jan 29, 2013 4:48 PM
Author: Steven Lord
Subject: Re: Generate perms([1:1:36])

"Sam " <ilmyounghwang@gmail.com> wrote in message

news:ke9ars$h1d$1@newscl01ah.mathworks.com...

> Hi all,

> I am trying to created a matrix that contains all possible permutations of

> [1:1:36]. It is obvious that this is too large a matrix. One option is to

> divide the huge matrix into many smaller pieces. But if I do not know how

> large a matrix will be, it would not be possible to have matlab divide it.

> Does anyone know what I can do in this case?

Why are you trying to create this matrix? It will be factorial(36)-by-36 or

of size [3.7199e+41, 36]. You don't have anywhere NEAR enough memory to

store it, and processing 1000 rows per second would require about 1e31 years

to process the whole thing.

I recommend you describe the problem you're trying to solve using these

permutations so that someone can suggest alternate approaches that don't

require such LONG periods of time.

http://en.wikipedia.org/wiki/Terasecond_and_longer [Hint: look in the

"Yottaseconds and beyond" section.]

--

Steve Lord

slord@mathworks.com

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