[petsc-users] Petsc Bag example redundancy

[Andrew Spott]

Isn't this redundant?

104:   PetscBagRegisterReal(bag, &user->alpha, 1.0, "alpha", "Linear coefficient");
105:   PetscBagRegisterReal(bag, &user->lambda, 6.0, "lambda", "Nonlinear coefficient");
106:   PetscBagSetFromOptions(bag);
107:   PetscOptionsGetReal(PETSC_NULL,"-alpha",&user->alpha,PETSC_NULL);
108:   PetscOptionsGetReal(PETSC_NULL,"-lambda",&user->lambda,PETSC_NULL);
(from http://www.mcs.anl.gov/petsc/petsc-current/src/snes/examples/tutorials/ex8.c.html )

Doesn't the PetscBagSetFromOptions allow you to load values into the structure using "-name", which means that the capabilities in lines 107 and 108 are implicit in the "PetscBagSetFromOptions" call.

Or do I not understand what PetscBagSetFromOptions does?

-Andrew
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