MATLAB: Mapping two binary bits to one

Question

I have generate a set of bits 0 and 1,

N=10000;

m=(sign(randn(1,N))+1)/2;

The problem is how do I group the bits? For example

00=-j

01=-1

10=1

11=j

Answer 1

vals = [-1j, -1, 1, 1j];
m2 = reshape(m, 2, []);
idx = m2(1,:) * 2 + m(2,:) + 1;
output = vals(idx);