[R] logistic transformation using nlminb

2008-05-16 Thread John Pitchard
Dear all, I want to find the optimal values of a vector, x (with 6 elements) say, satisfying the following conditions: 1. for all x=0 2. sum(x)=1 3. x[5]=0.5 and x[6]=0.5 For the minimisation I'm using nlminb and to satisfy the first 2 conditions the logistic transformation is used with box

[R] logistic transformation using nlminb

2008-05-15 Thread John Pitchard
Dear all, I want to find the optimal values of a vector, x (with 6 elements) say, satisfying the following conditions: 1. for all x=0 2. sum(x)=1 3. x[5]=0.5 and x[6]=0.5 For the minimisation I'm using nlminb and to satisfy the first 2 conditions the logistic transformation is used with box