Function to transform all input to a matrix. In addition, it checks whether all elements of the input are either 0 or 1.
checkMD(input)An R object. Can be a matrix/dataframe/vector/scalar.
checkMD() accepts one input and - if codeinput is a matrix - returns it without column names, otherwise transforms it into a matrix and returns it without column names. In case any of the elements of input are different from 0 or 1, it stops the routine and throws an error.