[R] Rsymphony

[Kaveh Vakili]

Hi list,

I have two question relating to the Rsymphony package:

a)  is there a way to use 'warm starts' ?
i.e. if i successively call Rsymphony_solve_LP()
with only one constraints change, does it perform the optimization
from the simplex-origin or does it uses the previously found solution
[i.e. as is common usage, see for instance lpsolveAPI]

b) to what extend are sparse matrix supported ?
i.e. if a constraint matrix is set as 
cbind(1,x,diag(dim(x)[1]),-diag(dim(x)[1])) is it understood as sparse ?


Best,