[Scipy-tickets] [SciPy] #243: linalg.qr to take mode argument
SciPy
scipy-tickets@scipy....
Wed Feb 27 15:03:59 CST 2008
#243: linalg.qr to take mode argument
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Reporter: oliphant | Owner: rkern
Type: defect | Status: assigned
Priority: high | Milestone: 0.7
Component: scipy.linalg | Version:
Severity: normal | Resolution:
Keywords: |
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Comment (by nils):
Is this ticket still valid ?
Scipy's qr:
{{{
qr(a, overwrite_a=0, lwork=None, econ=False, mode='qr')
Compute QR decomposition of a matrix.
Calculate the decomposition :lm:`A = Q R` where Q is
unitary/orthogonal
and R upper triangular.
Parameters
----------
a : array, shape (M, N)
Matrix to be decomposed
overwrite_a : boolean
Whether data in a is overwritten (may improve performance)
lwork : integer
Work array size, lwork >= a.shape[1]. If None or -1, an optimal
size
is computed.
econ : boolean
Whether to compute the economy-size QR decomposition, making
shapes
of Q and R (M, K) and (K, N) instead of (M,M) and (M,N).
K=min(M,N)
mode : {'qr', 'r'}
Determines what information is to be returned: either both Q and R
or only R.
}}}
Numpy's qr
{{{
qr(a, mode='full')
Compute QR decomposition of a matrix.
Calculate the decomposition :lm:`A = Q R` where Q is orthonormal
and R upper triangular.
Parameters
----------
a : array, shape (M, N)
Matrix to be decomposed
mode : {'full', 'r', 'economic'}
Determines what information is to be returned. 'full' is the
default.
Economic mode is slightly faster if only R is needed.
}}}
--
Ticket URL: <http://scipy.org/scipy/scipy/ticket/243#comment:4>
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