dlapll (l)  Linux Man Pages
dlapll: two column vectors X and Y, let A = ( X Y )
Command to display dlapll
manual in Linux: $ man l dlapll
NAME
DLAPLL  two column vectors X and Y, let A = ( X Y )
SYNOPSIS
 SUBROUTINE DLAPLL(

N, X, INCX, Y, INCY, SSMIN )

INTEGER
INCX, INCY, N

DOUBLE
PRECISION SSMIN

DOUBLE
PRECISION X( * ), Y( * )
PURPOSE
Given two column vectors X and Y, let
The subroutine first computes the QR factorization of A = Q*R,
and then computes the SVD of the 2by2 upper triangular matrix R.
The smaller singular value of R is returned in SSMIN, which is used
as the measurement of the linear dependency of the vectors X and Y.
ARGUMENTS
 N (input) INTEGER

The length of the vectors X and Y.
 X (input/output) DOUBLE PRECISION array,

dimension (1+(N1)*INCX)
On entry, X contains the Nvector X.
On exit, X is overwritten.
 INCX (input) INTEGER

The increment between successive elements of X. INCX > 0.
 Y (input/output) DOUBLE PRECISION array,

dimension (1+(N1)*INCY)
On entry, Y contains the Nvector Y.
On exit, Y is overwritten.
 INCY (input) INTEGER

The increment between successive elements of Y. INCY > 0.
 SSMIN (output) DOUBLE PRECISION

The smallest singular value of the Nby2 matrix A = ( X Y ).
Pages related to dlapll
 dlapll (3)
 dlapmt (l)  rearranges the columns of the M by N matrix X as specified by the permutation K(1),K(2),...,K(N) of the integers 1,...,N
 dla_gbamv (l)  performs one of the matrixvector operations y := alpha*abs(A)*abs(x) + beta*abs(y),
 dla_gbrcond (l)  DLA_GERCOND Estimate the Skeel condition number of op(A) * op2(C) where op2 is determined by CMODE as follows CMODE = 1 op2(C) = C CMODE = 0 op2(C) = I CMODE = 1 op2(C) = inv(C) The Skeel condition number cond(A) = norminf( inv(A)A ) is computed by computing scaling factors R such that diag(R)*A*op2(C) is row equilibrated and computing the standard infinitynorm condition number
 dla_gbrfsx_extended (l)  computes ..
 dla_geamv (l)  performs one of the matrixvector operations y := alpha*abs(A)*abs(x) + beta*abs(y),
 dla_gercond (l)  DLA_GERCOND estimate the Skeel condition number of op(A) * op2(C) where op2 is determined by CMODE as follows CMODE = 1 op2(C) = C CMODE = 0 op2(C) = I CMODE = 1 op2(C) = inv(C) The Skeel condition number cond(A) = norminf( inv(A)A ) is computed by computing scaling factors R such that diag(R)*A*op2(C) is row equilibrated and computing the standard infinitynorm condition number
 dla_gerfsx_extended (l)  computes ..