Hi! I have a quick question about KSP solvers. I will use the KSP solver to 
solve a time varying problem. My question is: do I need to call the following 
functions once in initialization, or do I need to call them in the time loop 
(solving equations in each time step)?

The functions I am not sure about include:
KSPSetOperators
KSPGetPC
PCSetType
KSPSetType
KSPSetFromOptions

Many thanks!
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