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RedHat 9 (Linux i386) - man page for slangt (redhat section l)

SLANGT(l)						  )						    SLANGT(l)

NAME
SLANGT - return the value of the one norm, or the Frobenius norm, or the infinity norm, or the element of largest absolute value of a real tridiagonal matrix A
SYNOPSIS
REAL FUNCTION SLANGT( NORM, N, DL, D, DU ) CHARACTER NORM INTEGER N REAL D( * ), DL( * ), DU( * )
PURPOSE
SLANGT returns the value of the one norm, or the Frobenius norm, or the infinity norm, or the element of largest absolute value of a real tridiagonal matrix A.
DESCRIPTION
SLANGT returns the value SLANGT = ( 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 matrix norm.
ARGUMENTS
NORM (input) CHARACTER*1 Specifies the value to be returned in SLANGT as described above. N (input) INTEGER The order of the matrix A. N >= 0. When N = 0, SLANGT is set to zero. DL (input) REAL array, dimension (N-1) The (n-1) sub-diagonal elements of A. D (input) REAL array, dimension (N) The diagonal elements of A. DU (input) REAL array, dimension (N-1) The (n-1) super-diagonal elements of A. LAPACK version 3.0 15 June 2000 SLANGT(l)


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