clangt man page on Scientific

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```CLANGT(1)	    LAPACK auxiliary routine (version 3.2)	     CLANGT(1)

NAME
CLANGT  -  returns the value of the one norm, or the Frobenius norm, or
the infinity norm, or the element of largest absolute value of  a  com‐
plex tridiagonal matrix A

SYNOPSIS
REAL FUNCTION CLANGT( NORM, N, DL, D, DU )

CHARACTER NORM

INTEGER   N

COMPLEX   D( * ), DL( * ), DU( * )

PURPOSE
CLANGT	returns	 the value of the one norm,  or the Frobenius norm, or
the  infinity norm,  or the  element of	largest absolute value	 of  a
complex tridiagonal matrix A.

DESCRIPTION
CLANGT returns the value
CLANGT = ( 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.

ARGUMENTS
NORM    (input) CHARACTER*1
Specifies the value to  be  returned  in	 CLANGT	 as  described
above.

N       (input) INTEGER
The  order of the matrix A.  N >= 0.  When N = 0, CLANGT is set
to zero.

DL      (input) COMPLEX array, dimension (N-1)
The (n-1) sub-diagonal elements of A.

D       (input) COMPLEX array, dimension (N)
The diagonal elements of A.

DU      (input) COMPLEX array, dimension (N-1)
The (n-1) super-diagonal elements of A.

LAPACK auxiliary routine (versioNovember 2008			     CLANGT(1)
```
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