org.netlib.lapack
Class SORMHR

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

public class SORMHR
extends java.lang.Object

SORMHR is a simplified interface to the JLAPACK routine sormhr.
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 * ======= * * SORMHR overwrites the general real M-by-N matrix C with * * SIDE = 'L' SIDE = 'R' * TRANS = 'N': Q * C C * Q * TRANS = 'T': Q**T * C C * Q**T * * where Q is a real orthogonal matrix of order nq, with nq = m if * SIDE = 'L' and nq = n if SIDE = 'R'. Q is defined as the product of * IHI-ILO elementary reflectors, as returned by SGEHRD: * * Q = H(ilo) H(ilo+1) . . . H(ihi-1). * * Arguments * ========= * * SIDE (input) CHARACTER*1 * = 'L': apply Q or Q**T from the Left; * = 'R': apply Q or Q**T from the Right. * * TRANS (input) CHARACTER*1 * = 'N': No transpose, apply Q; * = 'T': Transpose, apply Q**T. * * M (input) INTEGER * The number of rows of the matrix C. M >= 0. * * N (input) INTEGER * The number of columns of the matrix C. N >= 0. * * ILO (input) INTEGER * IHI (input) INTEGER * ILO and IHI must have the same values as in the previous call * of SGEHRD. Q is equal to the unit matrix except in the * submatrix Q(ilo+1:ihi,ilo+1:ihi). * If SIDE = 'L', then 1 <= ILO <= IHI <= M, if M > 0, and * ILO = 1 and IHI = 0, if M = 0; * if SIDE = 'R', then 1 <= ILO <= IHI <= N, if N > 0, and * ILO = 1 and IHI = 0, if N = 0. * * A (input) REAL array, dimension * (LDA,M) if SIDE = 'L' * (LDA,N) if SIDE = 'R' * The vectors which define the elementary reflectors, as * returned by SGEHRD. * * LDA (input) INTEGER * The leading dimension of the array A. * LDA >= max(1,M) if SIDE = 'L'; LDA >= max(1,N) if SIDE = 'R'. * * TAU (input) REAL array, dimension * (M-1) if SIDE = 'L' * (N-1) if SIDE = 'R' * TAU(i) must contain the scalar factor of the elementary * reflector H(i), as returned by SGEHRD. * * C (input/output) REAL array, dimension (LDC,N) * On entry, the M-by-N matrix C. * On exit, C is overwritten by Q*C or Q**T*C or C*Q**T or C*Q. * * LDC (input) INTEGER * The leading dimension of the array C. LDC >= max(1,M). * * WORK (workspace/output) REAL array, dimension (LWORK) * On exit, if INFO = 0, WORK(1) returns the optimal LWORK. * * LWORK (input) INTEGER * The dimension of the array WORK. * If SIDE = 'L', LWORK >= max(1,N); * if SIDE = 'R', LWORK >= max(1,M). * For optimum performance LWORK >= N*NB if SIDE = 'L', and * LWORK >= M*NB if SIDE = 'R', where NB is the optimal * blocksize. * * If LWORK = -1, then a workspace query is assumed; the routine * only calculates the optimal size of the WORK array, returns * this value as the first entry of the WORK array, and no error * message related to LWORK is issued by XERBLA. * * INFO (output) INTEGER * = 0: successful exit * < 0: if INFO = -i, the i-th argument had an illegal value * * ===================================================================== * * .. Local Scalars ..


Constructor Summary
SORMHR()
           
 
Method Summary
static void SORMHR(java.lang.String side, java.lang.String trans, int m, int n, int ilo, int ihi, float[][] a, float[] tau, float[][] c, float[] work, int lwork, intW info)
           
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

SORMHR

public SORMHR()
Method Detail

SORMHR

public static void SORMHR(java.lang.String side,
                          java.lang.String trans,
                          int m,
                          int n,
                          int ilo,
                          int ihi,
                          float[][] a,
                          float[] tau,
                          float[][] c,
                          float[] work,
                          int lwork,
                          intW info)