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Table 12 Condition numbers of original and BFGS preconditioned matrices

From: Newton–Raphson preconditioner for Krylov type solvers on GPU devices

  Condition number
First Last original
GR_30_30 \(1.95 \times 10^2\) \(7.81 \times 10^1\) \(1.95 \times 10^2\)
BCSSTK14 \(7.24 \times 10^3\) \(7.23 \times 10^3\) \(1.19 \times 10^{10}\)
BCSSTK15 \(8.21 \times 10^4\) \(9.23 \times 10^2\) \(6.54 \times 10^9\)
  1. Since BFGS preconditioner varies through GCR iterations, the condition numbers at the first and the last steps are shown