org.netlib.lapack
Class Slasy2

java.lang.Object
  extended by org.netlib.lapack.Slasy2

public class Slasy2
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 * ======= * * SLASY2 solves for the N1 by N2 matrix X, 1 <= N1,N2 <= 2, in * * op(TL)*X + ISGN*X*op(TR) = SCALE*B, * * where TL is N1 by N1, TR is N2 by N2, B is N1 by N2, and ISGN = 1 or * -1. op(T) = T or T', where T' denotes the transpose of T. * * Arguments * ========= * * LTRANL (input) LOGICAL * On entry, LTRANL specifies the op(TL): * = .FALSE., op(TL) = TL, * = .TRUE., op(TL) = TL'. * * LTRANR (input) LOGICAL * On entry, LTRANR specifies the op(TR): * = .FALSE., op(TR) = TR, * = .TRUE., op(TR) = TR'. * * ISGN (input) INTEGER * On entry, ISGN specifies the sign of the equation * as described before. ISGN may only be 1 or -1. * * N1 (input) INTEGER * On entry, N1 specifies the order of matrix TL. * N1 may only be 0, 1 or 2. * * N2 (input) INTEGER * On entry, N2 specifies the order of matrix TR. * N2 may only be 0, 1 or 2. * * TL (input) REAL array, dimension (LDTL,2) * On entry, TL contains an N1 by N1 matrix. * * LDTL (input) INTEGER * The leading dimension of the matrix TL. LDTL >= max(1,N1). * * TR (input) REAL array, dimension (LDTR,2) * On entry, TR contains an N2 by N2 matrix. * * LDTR (input) INTEGER * The leading dimension of the matrix TR. LDTR >= max(1,N2). * * B (input) REAL array, dimension (LDB,2) * On entry, the N1 by N2 matrix B contains the right-hand * side of the equation. * * LDB (input) INTEGER * The leading dimension of the matrix B. LDB >= max(1,N1). * * SCALE (output) REAL * On exit, SCALE contains the scale factor. SCALE is chosen * less than or equal to 1 to prevent the solution overflowing. * * X (output) REAL array, dimension (LDX,2) * On exit, X contains the N1 by N2 solution. * * LDX (input) INTEGER * The leading dimension of the matrix X. LDX >= max(1,N1). * * XNORM (output) REAL * On exit, XNORM is the infinity-norm of the solution. * * INFO (output) INTEGER * On exit, INFO is set to * 0: successful exit. * 1: TL and TR have too close eigenvalues, so TL or * TR is perturbed to get a nonsingular equation. * NOTE: In the interests of speed, this routine does not * check the inputs for errors. * * ===================================================================== * * .. Parameters ..


Field Summary
static boolean[] bswpiv
           
static int[] locl21
           
static int[] locu12
           
static int[] locu22
           
static boolean[] xswpiv
           
 
Constructor Summary
Slasy2()
           
 
Method Summary
static void slasy2(boolean ltranl, boolean ltranr, int isgn, int n1, int n2, float[] tl, int _tl_offset, int ldtl, float[] tr, int _tr_offset, int ldtr, float[] b, int _b_offset, int ldb, floatW scale, float[] x, int _x_offset, int ldx, floatW xnorm, intW info)
           
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Field Detail

locu22

public static int[] locu22

locl21

public static int[] locl21

locu12

public static int[] locu12

xswpiv

public static boolean[] xswpiv

bswpiv

public static boolean[] bswpiv
Constructor Detail

Slasy2

public Slasy2()
Method Detail

slasy2

public static void slasy2(boolean ltranl,
                          boolean ltranr,
                          int isgn,
                          int n1,
                          int n2,
                          float[] tl,
                          int _tl_offset,
                          int ldtl,
                          float[] tr,
                          int _tr_offset,
                          int ldtr,
                          float[] b,
                          int _b_offset,
                          int ldb,
                          floatW scale,
                          float[] x,
                          int _x_offset,
                          int ldx,
                          floatW xnorm,
                          intW info)