Creating a very large zero matrix without crashing the computer.

["Steve Su" <s.su@qut.edu.au>]

Dear All,

The subject is probably self explanatory. I want to create at least 1
million by 50 matrix, and then replace the zeros with 1's using some
index before doing some adding and multiplying calculations. 

Is it possible to create such a matrix in Splus using a standard PC or
UNIX? Are there any ways I can make the creation of this matrix very
efficient and use very little memory?

Thanks in advance.

Steve.