#include <math.h>
#include "superlu_zdefs.h"
Functions/Subroutines | |
| double | pzlangs (char *norm, SuperMatrix *A, gridinfo_t *grid) |
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.
=====================================================================
1.5.5