org.netlib.lapack
Class DORMRQ

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

public class DORMRQ
extends java.lang.Object

DORMRQ is a simplified interface to the JLAPACK routine dormrq.
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 * ======= * * DORMRQ 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 defined as the product of k * elementary reflectors * * Q = H(1) H(2) . . . H(k) * * as returned by DGERQF. Q is of order M if SIDE = 'L' and of order N * if SIDE = 'R'. * * 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. * * K (input) INTEGER * The number of elementary reflectors whose product defines * the matrix Q. * If SIDE = 'L', M >= K >= 0; * if SIDE = 'R', N >= K >= 0. * * A (input) DOUBLE PRECISION array, dimension * (LDA,M) if SIDE = 'L', * (LDA,N) if SIDE = 'R' * The i-th row must contain the vector which defines the * elementary reflector H(i), for i = 1,2,...,k, as returned by * DGERQF in the last k rows of its array argument A. * A is modified by the routine but restored on exit. * * LDA (input) INTEGER * The leading dimension of the array A. LDA >= max(1,K). * * TAU (input) DOUBLE PRECISION array, dimension (K) * TAU(i) must contain the scalar factor of the elementary * reflector H(i), as returned by DGERQF. * * C (input/output) DOUBLE PRECISION 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) DOUBLE PRECISION 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 * * ===================================================================== * * .. Parameters ..


Constructor Summary
DORMRQ()
           
 
Method Summary
static void DORMRQ(java.lang.String side, java.lang.String trans, int m, int n, int k, double[][] a, double[] tau, double[][] c, double[] 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

DORMRQ

public DORMRQ()
Method Detail

DORMRQ

public static void DORMRQ(java.lang.String side,
                          java.lang.String trans,
                          int m,
                          int n,
                          int k,
                          double[][] a,
                          double[] tau,
                          double[][] c,
                          double[] work,
                          int lwork,
                          intW info)