Change multiple coefficients in the problem. The coefficients that do not exist yet will be added to the problem. If many coefficients are being added to a row of the matrix, it may be more efficient to delete the old row of the matrix and add a new one.

con1 = x + y + z <= 2
con2 = x + y >= 1
con3 = x + 3*y = 1
p.addVariable (x,y,z)
p.addConstraint (con1, con2, con3)
p.chgmcoef ([con1,con1,con1,con2,con3], [x,y,z,x,x], [-2, -3, -3.2, 1, 3])

This changes five coefficients, three of which in the first constraint and one in each of the second and third constraints.

chgmcoef is more efficient than repeated calls to problem.chgcoef and should be used in its place if many coefficients are to be changed.

problem.chgcoef, problem.chgmqobj, problem.chgobj, problem.chgqobj, problem.chgrhs, problem.getcols, problem.getrhs.