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LAPACK
3.4.1
LAPACK: Linear Algebra PACKage
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Functions/Subroutines | |
subroutine | CLACON (N, V, X, EST, KASE) |
CLACON |
subroutine CLACON | ( | INTEGER | N, |
COMPLEX, dimension( n ) | V, | ||
COMPLEX, dimension( n ) | X, | ||
REAL | EST, | ||
INTEGER | KASE | ||
) |
CLACON
Download CLACON + dependencies [TGZ] [ZIP] [TXT]CLACON estimates the 1-norm of a square, complex matrix A. Reverse communication is used for evaluating matrix-vector products.
[in] | N | N is INTEGER The order of the matrix. N >= 1. |
[out] | V | V is COMPLEX array, dimension (N) On the final return, V = A*W, where EST = norm(V)/norm(W) (W is not returned). |
[in,out] | X | X is COMPLEX array, dimension (N) On an intermediate return, X should be overwritten by A * X, if KASE=1, A**H * X, if KASE=2, where A**H is the conjugate transpose of A, and CLACON must be re-called with all the other parameters unchanged. |
[in,out] | EST | EST is REAL On entry with KASE = 1 or 2 and JUMP = 3, EST should be unchanged from the previous call to CLACON. On exit, EST is an estimate (a lower bound) for norm(A). |
[in,out] | KASE | KASE is 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**H * X. On the final return from CLACON, KASE will again be 0. |
Definition at line 115 of file clacon.f.