Some preconditioner technique is also studied to improve the condition number and further accelerate iterations, comparisons are made between them by numerical results.
本文还研究了几种预条件技术，用于改善算子的条件数，进一步加速迭代，同时用数值结果对比了各自的优劣。
QR decomposition can improve the condition number of a matrix and then improve the numerical stability.
QR分解可以改善矩阵条件数，从而提高数值稳定性。
QR decomposition can improve the condition number of a matrix and then improve the numerical stability.
QR分解可以改善矩阵条件数，从而提高数值稳定性。
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