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Class org.netlib.blas.DTRSV

java.lang.Object
   |
   +----org.netlib.blas.DTRSV

public class DTRSV

extends Object

DTRSV is a simplified interface to the JLAPACK routine dtrsv.
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
 *  =======
 *
 *  DTRSV  solves one of the systems of equations
 *
 *     A*x = b,   or   A'*x = b,
 *
 *  where b and x are n element vectors and A is an n by n unit, or
 *  non-unit, upper or lower triangular matrix.
 *
 *  No test for singularity or near-singularity is included in this
 *  routine. Such tests must be performed before calling this routine.
 *
 *  Parameters
 *  ==========
 *
 *  UPLO   - CHARACTER*1.
 *           On entry, UPLO specifies whether the matrix is an upper or
 *           lower triangular matrix as follows:
 *
 *              UPLO = 'U' or 'u'   A is an upper triangular matrix.
 *
 *              UPLO = 'L' or 'l'   A is a lower triangular matrix.
 *
 *           Unchanged on exit.
 *
 *  TRANS  - CHARACTER*1.
 *           On entry, TRANS specifies the equations to be solved as
 *           follows:
 *
 *              TRANS = 'N' or 'n'   A*x = b.
 *
 *              TRANS = 'T' or 't'   A'*x = b.
 *
 *              TRANS = 'C' or 'c'   A'*x = b.
 *
 *           Unchanged on exit.
 *
 *  DIAG   - CHARACTER*1.
 *           On entry, DIAG specifies whether or not A is unit
 *           triangular as follows:
 *
 *              DIAG = 'U' or 'u'   A is assumed to be unit triangular.
 *
 *              DIAG = 'N' or 'n'   A is not assumed to be unit
 *                                  triangular.
 *
 *           Unchanged on exit.
 *
 *  N      - INTEGER.
 *           On entry, N specifies the order of the matrix A.
 *           N must be at least zero.
 *           Unchanged on exit.
 *
 *  A      - DOUBLE PRECISION array of DIMENSION ( LDA, n ).
 *           Before entry with  UPLO = 'U' or 'u', the leading n by n
 *           upper triangular part of the array A must contain the upper
 *           triangular matrix and the strictly lower triangular part of
 *           A is not referenced.
 *           Before entry with UPLO = 'L' or 'l', the leading n by n
 *           lower triangular part of the array A must contain the lower
 *           triangular matrix and the strictly upper triangular part of
 *           A is not referenced.
 *           Note that when  DIAG = 'U' or 'u', the diagonal elements of
 *           A are not referenced either, but are assumed to be unity.
 *           Unchanged on exit.
 *
 *  LDA    - INTEGER.
 *           On entry, LDA specifies the first dimension of A as declared
 *           in the calling (sub) program. LDA must be at least
 *           max( 1, n ).
 *           Unchanged on exit.
 *
 *  X      - DOUBLE PRECISION array of dimension at least
 *           ( 1 + ( n - 1 )*abs( INCX ) ).
 *           Before entry, the incremented array X must contain the n
 *           element right-hand side vector b. On exit, X is overwritten
 *           with the solution vector x.
 *
 *  INCX   - INTEGER.
 *           On entry, INCX specifies the increment for the elements of
 *           X. INCX must not be zero.
 *           Unchanged on exit.
 *
 *
 *  Level 2 Blas routine.
 *
 *  -- Written on 22-October-1986.
 *     Jack Dongarra, Argonne National Lab.
 *     Jeremy Du Croz, Nag Central Office.
 *     Sven Hammarling, Nag Central Office.
 *     Richard Hanson, Sandia National Labs.
 *
 *
 *     .. Parameters ..

DTRSV()

DTRSV(String, String, String, int, double[][], double[], int)

 public DTRSV()

 public static void DTRSV(String uplo,
                          String trans,
                          String diag,
                          int n,
                          double a[][],
                          double x[],
                          int incx)

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