SRC/zlantp.f(3)            Library Functions Manual            SRC/zlantp.f(3)

NAME
       SRC/zlantp.f

SYNOPSIS
   Functions/Subroutines
       double precision function zlantp (norm, uplo, diag, n, ap, work)
           ZLANTP returns the value of the 1-norm, or the Frobenius norm, or
           the infinity norm, or the element of largest absolute value of a
           triangular matrix supplied in packed form.

Function/Subroutine Documentation
   double precision function zlantp (character norm, character uplo, character
       diag, integer n, complex*16, dimension( * ) ap, double precision,
       dimension( * ) work)
       ZLANTP returns the value of the 1-norm, or the Frobenius norm, or the
       infinity norm, or the element of largest absolute value of a triangular
       matrix supplied in packed form.

       Purpose:


           !>
           !> ZLANTP  returns the value of the one norm,  or the Frobenius norm, or
           !> the  infinity norm,  or the  element of  largest absolute value  of a
           !> triangular matrix A, supplied in packed form.
           !>

       Returns
           ZLANTP

           !>
           !>    ZLANTP = ( max(abs(A(i,j))), NORM = 'M' or 'm'
           !>             (
           !>             ( norm1(A),         NORM = '1', 'O' or 'o'
           !>             (
           !>             ( normI(A),         NORM = 'I' or 'i'
           !>             (
           !>             ( normF(A),         NORM = 'F', 'f', 'E' or 'e'
           !>
           !> where  norm1  denotes the  one norm of a matrix (maximum column sum),
           !> normI  denotes the  infinity norm  of a matrix  (maximum row sum) and
           !> normF  denotes the  Frobenius norm of a matrix (square root of sum of
           !> squares).  Note that  max(abs(A(i,j)))  is not a consistent matrix norm.
           !>

       Parameters
           NORM

           !>          NORM is CHARACTER*1
           !>          Specifies the value to be returned in ZLANTP as described
           !>          above.
           !>

           UPLO

           !>          UPLO is CHARACTER*1
           !>          Specifies whether the matrix A is upper or lower triangular.
           !>          = 'U':  Upper triangular
           !>          = 'L':  Lower triangular
           !>

           DIAG

           !>          DIAG is CHARACTER*1
           !>          Specifies whether or not the matrix A is unit triangular.
           !>          = 'N':  Non-unit triangular
           !>          = 'U':  Unit triangular
           !>

           N

           !>          N is INTEGER
           !>          The order of the matrix A.  N >= 0.  When N = 0, ZLANTP is
           !>          set to zero.
           !>

           AP

           !>          AP is COMPLEX*16 array, dimension (N*(N+1)/2)
           !>          The upper or lower triangular matrix A, packed columnwise in
           !>          a linear array.  The j-th column of A is stored in the array
           !>          AP as follows:
           !>          if UPLO = 'U', AP(i + (j-1)*j/2) = A(i,j) for 1<=i<=j;
           !>          if UPLO = 'L', AP(i + (j-1)*(2n-j)/2) = A(i,j) for j<=i<=n.
           !>          Note that when DIAG = 'U', the elements of the array AP
           !>          corresponding to the diagonal elements of the matrix A are
           !>          not referenced, but are assumed to be one.
           !>

           WORK

           !>          WORK is DOUBLE PRECISION array, dimension (MAX(1,LWORK)),
           !>          where LWORK >= N when NORM = 'I'; otherwise, WORK is not
           !>          referenced.
           !>

       Author
           Univ. of Tennessee


           Univ. of California Berkeley


           Univ. of Colorado Denver


           NAG Ltd.

       Definition at line 124 of file zlantp.f.

Author
       Generated automatically by Doxygen for LAPACK from the source code.

LAPACK                          Version 3.12.0                 SRC/zlantp.f(3)