Hi, I am using constrOptim for a linear optimization problem. But it is giving an error that initial value is not feasible, even though the initial value provided is feasible. I am using the following code. ------------------Code---------------- fr<-function(x){ x1=x[1] x2=x[2] x3=x[3] x4=x[4] x5=x[5] x6=x[6] x7=x[7] x8=x[8] x9=x[9] x10=x[10] 2*x1+3*x2+4*x3-6*x4+x5+3*x8-4*x9+x10} x0<-c(0,0,0,0,0,0,0,0,1.4,0) Amat<- matrix(c(1,3,4,2,-2,-3,2,-1,0,6,2,4,1,-2,5,3,0,-3,-4,0,5,6,1,1,0,1,3,-1,-1,1,0,0,5,0,5,0,1,2,2,-2,1,4,-6,-3,-2,-1,5,2,1,0,-1,0,0,0,0,0,0,0,0,0,0,-1,0,0,0,0,0,0,0,0,0,0,-1,0,0,0,0,0,0,0,0,0,0,-1,0,0,0,0,0,0,0,0,0,0,-1,0,0,0,0,0,0,0,0,0,0,-1,0,0,0,0,0,0,0,0,0,0,-1,0,0,0,0,0,0,0,0,0,0,-1,0,0,0,0,0,0,0,0,0,0,-1,0,0,0,0,0,0,0,0,0,0,-1),10,15) bvec<-c(1,-2,-1,3,5,0,0,0,0,0,0,0,0,0,0) constrOptim(x0,fr,NULL,ui=-t(Amat),ci=-bvec) ---------------------------------------------------------- Can anyone help me with this. Thanks Amit [[alternative HTML version deleted]]