[Trilinos-Users] AztecOO guess

[Heroux, Mike]

AztecOO will use whatever values are present in the x vector.  If you have a good estimate, from a previous time step or nonlinear iteration, then make sure the x vector has those values prior to calling the Solve method.  If you have no initial guess, start with all zeros or a set of random values (you can use the Random method on the Epetra_Vector class if you like).

From: SungHwan Choi <sunghwanchoi91 at gmail.com<mailto:sunghwanchoi91 at gmail.com>>
Date: Sunday, March 10, 2013 8:44 PM
To: "trilinos-users at software.sandia.gov<mailto:trilinos-users at software.sandia.gov>" <trilinos-users at software.sandia.gov<mailto:trilinos-users at software.sandia.gov>>
Subject: [Trilinos-Users] AztecOO guess

Hi,
I have a question on setting guess vector in aztecoo.
I think initial value of output vector is set as initail guess but I am not sure becuase I couldn't find any reference on the initial guess of AztecOO

like below line,

Epetra_LinearProblem problem(matrix,&output,&input);

intial output is guessing vector. isn't it?

please let me know weather I am correct or not. If I am wrong, explain how to set initial guess.

Sunghwan Choi