48/50 Linear System Solver

[Manolo Sobrino]

Yes, this happens too with emu48 for the 48g. I guess it's the LU decomposition. You can try to decompose the coefficient matrix with the 50g and check by yourself that there is a nasty 1E-14 for the (3,3) element in the matrix L. It should be zero as it comes from a singular matrix (flag 54 doesn't seem to help BTW). The linear solver should check first that the matrix is invertible IMO, at least for small dimension matrices and/or integer coefficients, these potential side effects can cause quite a bit of trouble.