org.netlib.lapack
Class Slasr

java.lang.Object
  org.netlib.lapack.Slasr

public class Slasr
extends java.lang.Object

Following is the description from the original
Fortran source.  For each array argument, the Java
version will include an integer offset parameter, so
the arguments may not match the description exactly.
Contact seymour@cs.utk.edu with any questions.


 *     ..
 *
 *  Purpose
 *  =======
 *
 *  SLASR   performs the transformation
 *
 *     A := P*A,   when SIDE = 'L' or 'l'  (  Left-hand side )
 *
 *     A := A*P',  when SIDE = 'R' or 'r'  ( Right-hand side )
 *
 *  where A is an m by n real matrix and P is an orthogonal matrix,
 *  consisting of a sequence of plane rotations determined by the
 *  parameters PIVOT and DIRECT as follows ( z = m when SIDE = 'L' or 'l'
 *  and z = n when SIDE = 'R' or 'r' ):
 *
 *  When  DIRECT = 'F' or 'f'  ( Forward sequence ) then
 *
 *     P = P( z - 1 )*...*P( 2 )*P( 1 ),
 *
 *  and when DIRECT = 'B' or 'b'  ( Backward sequence ) then
 *
 *     P = P( 1 )*P( 2 )*...*P( z - 1 ),
 *
 *  where  P( k ) is a plane rotation matrix for the following planes:
 *
 *     when  PIVOT = 'V' or 'v'  ( Variable pivot ),
 *        the plane ( k, k + 1 )
 *
 *     when  PIVOT = 'T' or 't'  ( Top pivot ),
 *        the plane ( 1, k + 1 )
 *
 *     when  PIVOT = 'B' or 'b'  ( Bottom pivot ),
 *        the plane ( k, z )
 *
 *  c( k ) and s( k )  must contain the  cosine and sine that define the

 *  matrix  P( k ).  The two by two plane rotation part of the matrix
 *  P( k ), R( k ), is assumed to be of the form
 *
 *     R( k ) = (  c( k )  s( k ) ).
 *              ( -s( k )  c( k ) )
 *
 *  This version vectorises across rows of the array A when SIDE = 'L'.
 *
 *  Arguments
 *  =========
 *
 *  SIDE    (input) CHARACTER*1
 *          Specifies whether the plane rotation matrix P is applied to
 *          A on the left or the right.
 *          = 'L':  Left, compute A := P*A
 *          = 'R':  Right, compute A:= A*P'
 *
 *  DIRECT  (input) CHARACTER*1
 *          Specifies whether P is a forward or backward sequence of
 *          plane rotations.
 *          = 'F':  Forward, P = P( z - 1 )*...*P( 2 )*P( 1 )
 *          = 'B':  Backward, P = P( 1 )*P( 2 )*...*P( z - 1 )
 *
 *  PIVOT   (input) CHARACTER*1
 *          Specifies the plane for which P(k) is a plane rotation
 *          matrix.
 *          = 'V':  Variable pivot, the plane (k,k+1)
 *          = 'T':  Top pivot, the plane (1,k+1)
 *          = 'B':  Bottom pivot, the plane (k,z)
 *
 *  M       (input) INTEGER
 *          The number of rows of the matrix A.  If m <= 1, an immediate

 *          return is effected.
 *
 *  N       (input) INTEGER
 *          The number of columns of the matrix A.  If n <= 1, an
 *          immediate return is effected.
 *
 *  C, S    (input) REAL arrays, dimension
 *                  (M-1) if SIDE = 'L'
 *                  (N-1) if SIDE = 'R'
 *          c(k) and s(k) contain the cosine and sine that define the
 *          matrix P(k).  The two by two plane rotation part of the
 *          matrix P(k), R(k), is assumed to be of the form
 *          R( k ) = (  c( k )  s( k ) ).
 *                   ( -s( k )  c( k ) )
 *
 *  A       (input/output) REAL array, dimension (LDA,N)
 *          The m by n matrix A.  On exit, A is overwritten by P*A if
 *          SIDE = 'R' or by A*P' if SIDE = 'L'.
 *
 *  LDA     (input) INTEGER
 *          The leading dimension of the array A.  LDA >= max(1,M).
 *
 *  =====================================================================
 *
 *     .. Parameters ..

Constructor Summary

Slasr()

Method Summary

static void

slasr(java.lang.String side, java.lang.String pivot, java.lang.String direct, int m, int n, float[] c, int _c_offset, float[] s, int _s_offset, float[] a, int _a_offset, int lda)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Slasr

public Slasr()

Method Detail

slasr

public static void slasr(java.lang.String side,
                         java.lang.String pivot,
                         java.lang.String direct,
                         int m,
                         int n,
                         float[] c,
                         int _c_offset,
                         float[] s,
                         int _s_offset,
                         float[] a,
                         int _a_offset,
                         int lda)