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There is not BIT type in Matlab. Usually binary arrays are stored as LOGICAL, which are equivalent to UINT8. E.g.:
B = rand(16, 16) > 0.8; whos('B')
Now you can pack this in blocks of 8 elements to a UINT8 array:
T = 2 .^ (0:7).'; B8 = transpose(reshape(B, 8, )); BitArray = uint8(B8 * T);
this is not possible in MATLAB and in other languages too like C or C++. In modern computer architectures, a byte is the smallest addressable unit of memory. To pack multiple bits into a byte requires applying extra bit-shift operations. At the compiler level, it's a trade off of memory vs. speed requirements (and in high-performance software, those extra bit-shift operations can add up and slow down the application needlessly).