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Sparse.TConvergenceCheck Enumeration
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The criteria for convergence check.

Pascal
TConvergenceCheck = ( cvcNorm2, cvcNorm2InvA );
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Description 
cvcNorm2 
Iteration stops when the 2-norm of the residual divided by the 2-norm of the right-hand side is less than the value of the Tolerance property. 
cvcNorm2InvA 
Iteration stops when the 2-norm of M-inv times the residual divided by the 2-norm of M-inv times the right hand side is less than then value of Tolerance property, where M-inv is the inverse of the diagonal of A. 
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