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。
Condition number of matrix is a main root to result in large error in solution during the running of Gaussian algorithm.
在运行高斯算法求解线性系统过程中，矩阵条件数是导致求解误差偏大的一个因素。
The red and black ordering method about the coefficient matrix of a class of linear equations and the condition number of schur complement matrix deduced from red and black matrix are studied.
研究了一类线性方程组系数矩阵的红黑排序方法，以及由红黑排序矩阵导出的舒尔补矩阵的条件数。
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