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- CLACON - estimate the 1-norm of a square, complex matrix A
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- SUBROUTINE CLACON( N, V, X, EST, KASE )
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- INTEGER KASE, N
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- REAL EST
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- COMPLEX V( N ), X( N )
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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
- CLACON estimates the 1-norm of a square, complex matrix A. Reverse
- communication is used for evaluating matrix-vector products.
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- N (input) INTEGER
- The order of the matrix. N >= 1.
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- V (workspace) COMPLEX array, dimension (N)
- On the final return, V = A*W, where EST = norm(V)/norm(W) (W is
- not returned).
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- X (input/output) COMPLEX array, dimension (N)
- On an intermediate return, X should be overwritten by A * X, if
- KASE=1, A' * X, if KASE=2, where A' is the conjugate transpose of
- A, and CLACON must be re-called with all the other parameters
- unchanged.
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- EST (output) REAL
- An estimate (a lower bound) for norm(A).
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- KASE (input/output) INTEGER
- On the initial call to CLACON, KASE should be 0. On an
- intermediate return, KASE will be 1 or 2, indicating whether X
- should be overwritten by A * X or A' * X. On the final return
- from CLACON, KASE will again be 0.
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- Contributed by Nick Higham, University of Manchester.
- Originally named CONEST, dated March 16, 1988.
-
- Reference: N.J. Higham, "FORTRAN codes for estimating the one-norm of a
- real or complex matrix, with applications to condition estimation", ACM
- Trans. Math. Soft., vol. 14, no. 4, pp. 381-396, December 1988.
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- Last modified: April, 1999
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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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