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- CLANTR - return the value of the one norm, or the Frobenius norm, or the
- infinity norm, or the element of largest absolute value of a trapezoidal
- or triangular matrix A
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- REAL FUNCTION CLANTR( NORM, UPLO, DIAG, M, N, A, LDA, WORK )
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- CHARACTER DIAG, NORM, UPLO
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- INTEGER LDA, M, N
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- REAL WORK( * )
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- COMPLEX A( LDA, * )
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- These routines are part of the SCSL Scientific Library and can be loaded
- using either the -lscs or the -lscs_mp option. The -lscs_mp option
- directs the linker to use the multi-processor version of the library.
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- When linking to SCSL with -lscs or -lscs_mp, the default integer size is
- 4 bytes (32 bits). Another version of SCSL is available in which integers
- are 8 bytes (64 bits). This version allows the user access to larger
- memory sizes and helps when porting legacy Cray codes. It can be loaded
- by using the -lscs_i8 option or the -lscs_i8_mp option. A program may use
- only one of the two versions; 4-byte integer and 8-byte integer library
- calls cannot be mixed.
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- PPPPUUUURRRRPPPPOOOOSSSSEEEE
- CLANTR returns the value of the one norm, or the Frobenius norm, or the
- infinity norm, or the element of largest absolute value of a trapezoidal
- or triangular matrix A.
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- CLANTR returns the value
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- CLANTR = ( 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'
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- 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.
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- NORM (input) CHARACTER*1
- Specifies the value to be returned in CLANTR as described above.
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- UPLO (input) CHARACTER*1
- Specifies whether the matrix A is upper or lower trapezoidal. =
- 'U': Upper trapezoidal
- = 'L': Lower trapezoidal Note that A is triangular instead of
- trapezoidal if M = N.
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- DIAG (input) CHARACTER*1
- Specifies whether or not the matrix A has unit diagonal. = 'N':
- Non-unit diagonal
- = 'U': Unit diagonal
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- M (input) INTEGER
- The number of rows of the matrix A. M >= 0, and if UPLO = 'U', M
- <= N. When M = 0, CLANTR is set to zero.
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- N (input) INTEGER
- The number of columns of the matrix A. N >= 0, and if UPLO =
- 'L', N <= M. When N = 0, CLANTR is set to zero.
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- A (input) COMPLEX array, dimension (LDA,N)
- The trapezoidal matrix A (A is triangular if M = N). If UPLO =
- 'U', the leading m by n upper trapezoidal part of the array A
- contains the upper trapezoidal matrix, and the strictly lower
- triangular part of A is not referenced. If UPLO = 'L', the
- leading m by n lower trapezoidal part of the array A contains the
- lower trapezoidal matrix, and the strictly upper triangular part
- of A is not referenced. Note that when DIAG = 'U', the diagonal
- elements of A are not referenced and are assumed to be one.
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- LDA (input) INTEGER
- The leading dimension of the array A. LDA >= max(M,1).
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- WORK (workspace) REAL array, dimension (LWORK),
- where LWORK >= M when NORM = 'I'; otherwise, WORK is not
- referenced.
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- INTRO_LAPACK(3S), INTRO_SCSL(3S)
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- This man page is available only online.
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- PPPPaaaaggggeeee 2222
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