convert rows of 0's/1's to binary, xor

["Knut M. Wittkowski" <kmw@rockefeller.edu>]

I have HUGE matrices containing only 0's and 1's and I would like to 
convert each row to a string, so that each element takes only one bit, 
rather than four bytes = 32 bits. (Yes, with matrices of a couple of 
million elements, space can be important.)
- is there a conversion routine

        Str <- BinToStr(c(0,1,0,0,0,0,0,1))
        Chr <- "A"

  so that?

        Str == Chr

- are there logical routines so that

        AAA <- BinToStr(c(0,1,0,0,0,0,0,1))
        One <- BinToStr(c(0,0,1,1,0,0,0,1))

        BinAND(AAA,One) == BinToStr(c(0,0,0,0,0,0,0,1))

        BinAny(BinAND(AAA,One)) == T

Of course, this should not be limited to a single byte at a time.


Knut M. Wittkowski, PhD,DSc
------------------------------------------
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kmw@rockefeller.edu
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