All Packages Class Hierarchy This Package Previous Next Index
java.lang.Object | +----org.netlib.lapack.DOPMTR
DOPMTR is a simplified interface to the JLAPACK routine dopmtr. 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 * ======= * * DOPMTR 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 * nq-1 elementary reflectors, as returned by DSPTRD using packed * storage: * * if UPLO = 'U', Q = H(nq-1) . . . H(2) H(1); * * if UPLO = 'L', Q = H(1) H(2) . . . H(nq-1). * * Arguments * ========= * * SIDE (input) CHARACTER*1 * = 'L': apply Q or Q**T from the Left; * = 'R': apply Q or Q**T from the Right. * * UPLO (input) CHARACTER*1 * = 'U': Upper triangular packed storage used in previous * call to DSPTRD; * = 'L': Lower triangular packed storage used in previous * call to DSPTRD. * * 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. * * AP (input) DOUBLE PRECISION array, dimension * (M*(M+1)/2) if SIDE = 'L' * (N*(N+1)/2) if SIDE = 'R' * The vectors which define the elementary reflectors, as * returned by DSPTRD. AP is modified by the routine but * restored on exit. * * TAU (input) DOUBLE PRECISION array, dimension (M-1) if SIDE = 'L' * or (N-1) if SIDE = 'R' * TAU(i) must contain the scalar factor of the elementary * reflector H(i), as returned by DSPTRD. * * 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) DOUBLE PRECISION array, dimension * (N) if SIDE = 'L' * (M) if SIDE = 'R' * * INFO (output) INTEGER * = 0: successful exit * < 0: if INFO = -i, the i-th argument had an illegal value * * ===================================================================== * * .. Parameters ..
public DOPMTR()
public static void DOPMTR(String side, String uplo, String trans, int m, int n, double ap[], double tau[], double c[][], double work[], intW info)
All Packages Class Hierarchy This Package Previous Next Index