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clacon.f(3) LAPACK clacon.f(3) NAME clacon.f  SYNOPSIS Functions/Subroutines subroutine clacon (N, V, X, EST, KASE) CLACON estimates the 1norm of a square matrix, using reverse communication for evaluating matrixvector products. Function/Subroutine Documentation subroutine clacon (integerN, complex, dimension( n )V, complex, dimension( n )X, realEST, integerKASE) CLACON estimates the 1norm of a square matrix, using reverse communication for evaluating matrixvector products. Purpose: CLACON estimates the 1norm of a square, complex matrix A. Reverse communication is used for evaluating matrixvector products. Parameters: N N is INTEGER The order of the matrix. N >= 1. V V is COMPLEX array, dimension (N) On the final return, V = A*W, where EST = norm(V)/norm(W) (W is not returned). 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 recalled with all the other parameters unchanged. 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). 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. Author: Univ. of Tennessee Univ. of California Berkeley Univ. of Colorado Denver NAG Ltd. Date: September 2012 Further Details: Originally named CONEST, dated March 16, 1988. Last modified: April, 1999 Contributors: Nick Higham, University of Manchester References: N.J. Higham, 'FORTRAN codes for estimating the onenorm of a real or complex matrix, with applications to condition estimation', ACM Trans. Math. Soft., vol. 14, no. 4, pp. 381396, December 1988. Definition at line 115 of file clacon.f. Author Generated automatically by Doxygen for LAPACK from the source code. Version 3.4.2 Tue Sep 25 2012 clacon.f(3)