set.semicont(lprec, columns, sc = TRUE){1, ..., n} (where n is the number of decision variables in lprec) specifying which variables should be made semicontinuous.FALSE the decision variables specified in columns will have their kind set to standard.real or integer and indicates the type of values the decision variable may take. The kind is one of {standard, semi-continuous, SOS}. Semi-continuous decision variables can take allowed values between their upper and lower bound as well as zero. Please see the link in the references for further details.