Rank-one updates of Cholesky factors
秩一个更新的Cholesky因素
用法----------Usage----------
参数----------Arguments----------
参数:R
an upper-triangular matrix
上三角矩阵
参数:x
a vector
一个向量
Details
详细信息----------Details----------
chud computes Q such that:
chud计算Q,使得:
chdd computes Q such that:
chdd计算Q,使得:
chdd reports an error if R^T R - x x^T is not positive definite. The two functions use LINPACK's dchud and dchdd routines respectively, two of the few routines from LINPACK without analogues in LAPACK.
chdd报告错误,如果R^T R - x x^T是正定。这两个函数的使用LINPACK的dchud和dchdd例程,的几个例程LINPACK没有类似的LAPACK。