org.netlib.lapack
Class SLAGS2

java.lang.Object
  extended by org.netlib.lapack.SLAGS2

public class SLAGS2
extends java.lang.Object

SLAGS2 is a simplified interface to the JLAPACK routine slags2.
This interface converts Java-style 2D row-major arrays into
the 1D column-major linearized arrays expected by the lower
level JLAPACK routines.  Using this interface also allows you
to omit offset and leading dimension arguments.  However, because
of these conversions, these routines will be slower than the low
level ones.  Following is the description from the original Fortran
source.  Contact seymour@cs.utk.edu with any questions.

* .. * * Purpose * ======= * * SLAGS2 computes 2-by-2 orthogonal matrices U, V and Q, such * that if ( UPPER ) then * * U'*A*Q = U'*( A1 A2 )*Q = ( x 0 ) * ( 0 A3 ) ( x x ) * and * V'*B*Q = V'*( B1 B2 )*Q = ( x 0 ) * ( 0 B3 ) ( x x ) * * or if ( .NOT.UPPER ) then * * U'*A*Q = U'*( A1 0 )*Q = ( x x ) * ( A2 A3 ) ( 0 x ) * and * V'*B*Q = V'*( B1 0 )*Q = ( x x ) * ( B2 B3 ) ( 0 x ) * * The rows of the transformed A and B are parallel, where * * U = ( CSU SNU ), V = ( CSV SNV ), Q = ( CSQ SNQ ) * ( -SNU CSU ) ( -SNV CSV ) ( -SNQ CSQ ) * * Z' denotes the transpose of Z. * * * Arguments * ========= * * UPPER (input) LOGICAL * = .TRUE.: the input matrices A and B are upper triangular. * = .FALSE.: the input matrices A and B are lower triangular. * * A1 (input) REAL * A2 (input) REAL * A3 (input) REAL * On entry, A1, A2 and A3 are elements of the input 2-by-2 * upper (lower) triangular matrix A. * * B1 (input) REAL * B2 (input) REAL * B3 (input) REAL * On entry, B1, B2 and B3 are elements of the input 2-by-2 * upper (lower) triangular matrix B. * * CSU (output) REAL * SNU (output) REAL * The desired orthogonal matrix U. * * CSV (output) REAL * SNV (output) REAL * The desired orthogonal matrix V. * * CSQ (output) REAL * SNQ (output) REAL * The desired orthogonal matrix Q. * * ===================================================================== * * .. Parameters ..


Constructor Summary
SLAGS2()
           
 
Method Summary
static void SLAGS2(boolean upper, float a1, float a2, float a3, float b1, float b2, float b3, floatW csu, floatW snu, floatW csv, floatW snv, floatW csq, floatW snq)
           
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

SLAGS2

public SLAGS2()
Method Detail

SLAGS2

public static void SLAGS2(boolean upper,
                          float a1,
                          float a2,
                          float a3,
                          float b1,
                          float b2,
                          float b3,
                          floatW csu,
                          floatW snu,
                          floatW csv,
                          floatW snv,
                          floatW csq,
                          floatW snq)