scipy.linalg.lapack.stpmqrt#

scipy.linalg.lapack.stpmqrt(l, v, t, a, b, side='L', trans='N', overwrite_a=0, overwrite_b=0) = <flapack function stpmqrt>#

Multiply a matrix by the Q of a triangular-pentagonal QR factorization (LAPACK stpmqrt).

The matrix multiplied is the pair (a, b), the same split tpqrt uses.

Parameters:

lint: Order of the trapezoidal part of v; 0 makes it rectangular.
vndarray: The reflectors tpqrt left in its b.
tndarray: Upper triangular block reflectors, shape (nb, k). Its row count is taken as the block size and its column count as the reflector count.
andarray: Leading block; shape (k, n) when side is 'L' and (m, k) when 'R'.
bndarray: Trailing block, shape (m, n).
sidestr, optional: 'L' for Q @ c, 'R' for c @ Q. Default is 'L'.
transstr, optional: 'N' to apply Q, 'T' to apply its transpose. Default is 'N'.
overwrite_aint, optional: If nonzero, a may be overwritten in place. Default is 0.
overwrite_bint, optional: If nonzero, b may be overwritten in place. Default is 0.

Returns:

andarray: The leading block of the product.
bndarray: The trailing block of the product.
infoint: 0 on success; if negative, the -info-th argument had an illegal value.