SuperLU Distributed 8.2.1
Distributed memory sparse direct solver
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Returns the value of the one norm, the infinity norm, or the element of largest value Modified from SuperLU routine SLANGS. More...
Functions | |
float | slangs_dist (char *norm, SuperMatrix *A) |
Returns the value of the one norm, the infinity norm, or the element of largest value Modified from SuperLU routine SLANGS.
Copyright (c) 2003, The Regents of the University of California, through Lawrence Berkeley National Laboratory (subject to receipt of any required approvals from U.S. Dept. of Energy)
All rights reserved.
The source code is distributed under BSD license, see the file License.txt at the top-level directory.
-- SuperLU routine (version 2.0) -- Univ. of California Berkeley, Xerox Palo Alto Research Center, and Lawrence Berkeley National Lab. November 15, 1997
float slangs_dist | ( | char * | norm, |
SuperMatrix * | A | ||
) |
Purpose ======= SLANGS_DIST 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 matrix A. Description =========== SLANGE returns the value SLANGE = ( 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' 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. Arguments ========= NORM (input) CHARACTER*1 Specifies the value to be returned in SLANGE as described above. A (input) SuperMatrix* The M by N sparse matrix A. =====================================================================