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- SLANSY - 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
- symmetric matrix A
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- SSSSYYYYNNNNOOOOPPPPSSSSIIIISSSS
- REAL FUNCTION SLANSY( NORM, UPLO, N, A, LDA, WORK )
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- CHARACTER NORM, UPLO
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- INTEGER LDA, N
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- REAL A( LDA, * ), WORK( * )
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- IIIIMMMMPPPPLLLLEEEEMMMMEEEENNNNTTTTAAAATTTTIIIIOOOONNNN
- 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
- SLANSY 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
- symmetric matrix A.
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- DDDDEEEESSSSCCCCRRRRIIIIPPPPTTTTIIIIOOOONNNN
- SLANSY returns the value
-
- SLANSY = ( 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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- PPPPaaaaggggeeee 1111
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- SSSSLLLLAAAANNNNSSSSYYYY((((3333SSSS)))) SSSSLLLLAAAANNNNSSSSYYYY((((3333SSSS))))
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- ARGUMENTS
- NORM (input) CHARACTER*1
- Specifies the value to be returned in SLANSY as described above.
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- UPLO (input) CHARACTER*1
- Specifies whether the upper or lower triangular part of the
- symmetric matrix A is to be referenced. = 'U': Upper triangular
- part of A is referenced
- = 'L': Lower triangular part of A is referenced
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- N (input) INTEGER
- The order of the matrix A. N >= 0. When N = 0, SLANSY is set to
- zero.
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- A (input) REAL array, dimension (LDA,N)
- The symmetric matrix A. If UPLO = 'U', the leading n by n upper
- triangular part of A contains the upper triangular part of the
- matrix A, and the strictly lower triangular part of A is not
- referenced. If UPLO = 'L', the leading n by n lower triangular
- part of A contains the lower triangular part of the matrix A, and
- the strictly upper triangular part of A is not referenced.
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- LDA (input) INTEGER
- The leading dimension of the array A. LDA >= max(N,1).
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- WORK (workspace) REAL array, dimension (LWORK),
- where LWORK >= N when NORM = 'I' or '1' or 'O'; otherwise, WORK
- is not referenced.
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- SSSSEEEEEEEE AAAALLLLSSSSOOOO
- 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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