<div class="gmail_quote">On Sat, Sep 17, 2011 at 01:24, Vijay S. Mahadevan <span dir="ltr"><<a href="mailto:vijay.m@gmail.com">vijay.m@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
Also calling newton even without the matrix free jacobian with just Picard linearization with an algebraic preconditioner is sometimes more efficient.</blockquote></div><br><div>Yes, these linear systems are usually easier to solve. For example, they may have isotropic coefficients while Newton linearization effectively produces anisotropic coefficients.</div>
<div><br></div><div>On the other hand, the nonlinear convergence is only linear and often requires many more iterations than Newton, especially in the terminal phase. This tradeoff is of course highly problem dependent.</div>