org.netlib.lapack
Class SLAQTR

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

public class SLAQTR
extends java.lang.Object

SLAQTR is a simplified interface to the JLAPACK routine slaqtr.
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 * ======= * * SLAQTR solves the real quasi-triangular system * * op(T)*p = scale*c, if LREAL = .TRUE. * * or the complex quasi-triangular systems * * op(T + iB)*(p+iq) = scale*(c+id), if LREAL = .FALSE. * * in real arithmetic, where T is upper quasi-triangular. * If LREAL = .FALSE., then the first diagonal block of T must be * 1 by 1, B is the specially structured matrix * * B = [ b(1) b(2) ... b(n) ] * [ w ] * [ w ] * [ . ] * [ w ] * * op(A) = A or A', A' denotes the conjugate transpose of * matrix A. * * On input, X = [ c ]. On output, X = [ p ]. * [ d ] [ q ] * * This subroutine is designed for the condition number estimation * in routine STRSNA. * * Arguments * ========= * * LTRAN (input) LOGICAL * On entry, LTRAN specifies the option of conjugate transpose: * = .FALSE., op(T+i*B) = T+i*B, * = .TRUE., op(T+i*B) = (T+i*B)'. * * LREAL (input) LOGICAL * On entry, LREAL specifies the input matrix structure: * = .FALSE., the input is complex * = .TRUE., the input is real * * N (input) INTEGER * On entry, N specifies the order of T+i*B. N >= 0. * * T (input) REAL array, dimension (LDT,N) * On entry, T contains a matrix in Schur canonical form. * If LREAL = .FALSE., then the first diagonal block of T must * be 1 by 1. * * LDT (input) INTEGER * The leading dimension of the matrix T. LDT >= max(1,N). * * B (input) REAL array, dimension (N) * On entry, B contains the elements to form the matrix * B as described above. * If LREAL = .TRUE., B is not referenced. * * W (input) REAL * On entry, W is the diagonal element of the matrix B. * If LREAL = .TRUE., W is not referenced. * * SCALE (output) REAL * On exit, SCALE is the scale factor. * * X (input/output) REAL array, dimension (2*N) * On entry, X contains the right hand side of the system. * On exit, X is overwritten by the solution. * * WORK (workspace) REAL array, dimension (N) * * INFO (output) INTEGER * On exit, INFO is set to * 0: successful exit. * 1: the some diagonal 1 by 1 block has been perturbed by * a small number SMIN to keep nonsingularity. * 2: the some diagonal 2 by 2 block has been perturbed by * a small number in SLALN2 to keep nonsingularity. * NOTE: In the interests of speed, this routine does not * check the inputs for errors. * * ===================================================================== * * .. Parameters ..


Constructor Summary
SLAQTR()
           
 
Method Summary
static void SLAQTR(boolean ltran, boolean lreal, int n, float[][] t, float[] b, float w, floatW scale, float[] x, float[] work, intW info)
           
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

SLAQTR

public SLAQTR()
Method Detail

SLAQTR

public static void SLAQTR(boolean ltran,
                          boolean lreal,
                          int n,
                          float[][] t,
                          float[] b,
                          float w,
                          floatW scale,
                          float[] x,
                          float[] work,
                          intW info)