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CULA • View topic - Can convergence criterion be specified?

Can convergence criterion be specified?

General CULA Sparse support and troubleshooting. Use this forum if you are having a general problem or have encountered a bug.

Can convergence criterion be specified?

Postby phoebe » Wed Mar 21, 2012 2:02 am

In CULASparseReferenceManual, "Unless otherwise specified, all of CULA Sparse’s iteration calculations are done with regards to a residual relative to
the norm of the right hand side of the linear system."
I want to know that can users specify the convergence criterion? For example, can I change this criterion to that the maximum absolute value of the change of x is less than a predefined value and how? Many thanks!
phoebe
 
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Re: Can convergence criterion be specified?

Postby kyle » Wed Mar 21, 2012 7:22 am

CULA Sparse has built in stagnation checking where if the residual doesn't change within in a relative window, a "stagnation" result is returned. This is currently a fixed ratio based off the machine precision and various norm.

However, we will consider allowing for a user specified stagnation condition for a future release.

Would a typical usage scenario simply exit after 'n' consecutive residuals of less than 'threshold' change? Would n always be 2 or should it be specified?
kyle
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Re: Can convergence criterion be specified?

Postby phoebe » Wed Mar 21, 2012 8:02 pm

phoebe
 
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Re: Can convergence criterion be specified?

Postby phoebe » Wed Mar 21, 2012 8:03 pm

phoebe
 
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