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qr
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1994-02-21
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602b
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26 lines
qr:
Syntax: qr ( A )
qr ( A , "p" )
Description:
Qr computes the QR decomposition of the input matrix A such
that:
A = Q * R
or
A*p = Q * R
Qr returns a list containing elements `q' and `r'. Optionally,
qr can take a second argument ("p"), which tells qr to perform
column pivoting when computing [q] and [r]. The permutation
matrix `p' is returned in the same list as `q' and `r'.
Qr utilizes LAPACK subroutines DGEQRF and DORGQR for REAL
inputs, and ZGEQRF and ZUNGQR for COMPLEX inputs. When column
pivoting is requested the LAPACK subroutines DGEQPF, and
ZGEQPF are used.