Hello PETSc users! I am using Tao for an unconstrained minimization problem. I have found that CG works better than the other types for this application. After about 85 iterations, I get an error about line search failure. I'm not clear on what this means, or how I could mitigate the problem, and neither the manual nor FAQ give any guidance. Can anyone suggest things I could try to help the method converge? I have function and gradient info, but no Hessian.
Thanks, Ellen Price
