convert integer to binary or binary to integer

convert a column vetor of integers to a column vector of binaries or vice versa

example:
int2bin([2; 5; 15]) = [0 0 1 0;0 1 0 1;1 1 1 1]
or
bin2int([ 0 1 1; 2 2 2], 3) = [4; 26] (in a three digit system)