SuperLU Distributed 8.2.1
Distributed memory sparse direct solver
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Returns the value of the one norm, or the Frobenius norm, or the infinity norm, or the element of largest value. More...
Functions | |
double | pzlangs (char *norm, SuperMatrix *A, gridinfo_t *grid) |
Returns the value of the one norm, or the Frobenius norm, or the infinity norm, or the element of largest value.
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.
File name: pzlangs.c History: Modified from lapack routine ZLANGE
double pzlangs | ( | char * | norm, |
SuperMatrix * | A, | ||
gridinfo_t * | grid | ||
) |
Purpose ======= PZLANGS 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 =========== PZLANGE returns the value PZLANGE = ( 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 DLANGE as described above. A (input) SuperMatrix* The M by N sparse matrix A. GRID (input) gridinof_t* The 2D process mesh. =====================================================================