Try
npm1 = z0 1 + z1 2 + z2 3 + z3 4; NMinimize[{npm1,z0+z1+z2+z3==1&&0<=z0<=1&&0<=z1<=1&&0<=z2<=1&&0<=z3<=1},{z0,z1,z2,z3}]
If you want to constrain your variables to be 0 or 1 then you should look at
Element[z0,Integers]&&0<=z0<=1
Otherwise your variables can have any value between 0 and 1
This
Set::write: Tag Plus in a0+b0 is Protected.
error is probably because of using = instead of == in
z0+z1+z2+z3==1
Should I use "&&" between defining the constraints? I have already defined them as integers:
&&
{a0, a1, a2, a3, b0, b1, b2, b3, z0, z1, z2, z3} \[Element] Integers}
So, why it is not a valid variable ? and protected? Thanks,
