I need help generating all possible combination of a vector of randomly
assigned values of 1 and -1. For example, a vector of 20 randomly placed 1s
and -1s, and all possibilities (which would amount to 2^20 total vectors). I
am able to generate one such vector (via sample(c(-1,1),20,replace=TRUE)), but
I do not know how to generate all the possibilities, which would need to be
placed in a matrix. Any help would be greatly appreciated!!!
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