Linear constraints in mixture design
I am facing difficulties in implementing the constraints for my mixture design. The design consists of water as a filler and four additives, namely A1, A2, A3, and A4, which have specified value ranges. I need to impose a combination constraint that allows a maximum of two out of the three factors, A2, A3, and A4, to be used simultaneously. A1 and water are not important in constraining, but it is...