Set a decision variable as semicontinuous in an lpSolve linear program model object.
set.semicont(lprec, columns, sc = TRUE)an lpSolve linear program model object.
a numeric vector of unique values from the set {1, …, n} (where n is the number of decision variables in lprec) specifying which variables should be made semicontinuous.
a logical value. If FALSE the decision variables specified in columns will have their kind set to standard.
a NULL value is invisibly returned.
Decision variables have both a type and a kind. The type is either 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.