BLAS/SRC/strmv.f(3)        Library Functions Manual        BLAS/SRC/strmv.f(3)

NAME
       BLAS/SRC/strmv.f

SYNOPSIS
   Functions/Subroutines
       subroutine strmv (uplo, trans, diag, n, a, lda, x, incx)
           STRMV

Function/Subroutine Documentation
   subroutine strmv (character uplo, character trans, character diag, integer
       n, real, dimension(lda,*) a, integer lda, real, dimension(*) x, integer
       incx)
       STRMV

       Purpose:


           !>
           !> STRMV  performs one of the matrix-vector operations
           !>
           !>    x := A*x,   or   x := A**T*x,
           !>
           !> where x is an n element vector and  A is an n by n unit, or non-unit,
           !> upper or lower triangular matrix.
           !>

       Parameters
           UPLO

           !>          UPLO is 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.
           !>

           TRANS

           !>          TRANS is CHARACTER*1
           !>           On entry, TRANS specifies the operation to be performed as
           !>           follows:
           !>
           !>              TRANS = 'N' or 'n'   x := A*x.
           !>
           !>              TRANS = 'T' or 't'   x := A**T*x.
           !>
           !>              TRANS = 'C' or 'c'   x := A**T*x.
           !>

           DIAG

           !>          DIAG is 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.
           !>

           N

           !>          N is INTEGER
           !>           On entry, N specifies the order of the matrix A.
           !>           N must be at least zero.
           !>

           A

           !>          A is REAL array, 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.
           !>

           LDA

           !>          LDA is 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 ).
           !>

           X

           !>          X is REAL array, dimension at least
           !>           ( 1 + ( n - 1 )*abs( INCX ) ).
           !>           Before entry, the incremented array X must contain the n
           !>           element vector x. On exit, X is overwritten with the
           !>           transformed vector x.
           !>

           INCX

           !>          INCX is INTEGER
           !>           On entry, INCX specifies the increment for the elements of
           !>           X. INCX must not be zero.
           !>

       Author
           Univ. of Tennessee


           Univ. of California Berkeley


           Univ. of Colorado Denver


           NAG Ltd.

       Further Details:


           !>
           !>  Level 2 Blas routine.
           !>  The vector and matrix arguments are not referenced when N = 0, or M = 0
           !>
           !>  -- 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.
           !>

       Definition at line 146 of file strmv.f.

Author
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LAPACK                          Version 3.12.0             BLAS/SRC/strmv.f(3)