Hi all R users,
I want to create a matrix having n columns and 2^n rows, and all its entries
are only 0 or 1. In each row, column i is 0 means dimension i is chosen, 0
means not.  The matrix will contains all the possible combination of those n
dimensions.

Here is an example, if n = 3, the matrix will look like:
0 0 0
0 0 1
0 1 0
1 0 0
0 1 1
1 0 1
1 1 1


I know I can use n "for" loops to do this, but is there a better way?
Thanks,
-zm

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