dlangs (3p)

Name

dlangs - norm, or the Frobenius-norm, or the infinity-norm, or the element with largest absolute value of a general real matrix A in sparse format.

Synopsis

#include <sunperf.h>


float slangs(char *norm, SuperMatrix *A)


double dlangs(char *norm, SuperMatrix *A)


float clangs(char *norm, SuperMatrix *A)


double zlangs(char *norm, SuperMatrix *A)


float slangs_64(char *norm, SuperMatrix_64 *A)


double dlangs_64(char *norm, SuperMatrix_64 *A)


float clangs_64(char *norm, SuperMatrix_64 *A)


double zlangs_64(char *norm, SuperMatrix_64 *A)

Description

Oracle Solaris Studio Performance Library                            langs(3P)



NAME
       langs:  clangs,  dlangs, slangs, zlangs - returns the value of the one-
       norm, or the Frobenius-norm, or the infinity-norm, or the element  with
       largest absolute value of a general real matrix A in sparse format.


SYNOPSIS
       #include <sunperf.h>


       float slangs(char *norm, SuperMatrix *A)


       double dlangs(char *norm, SuperMatrix *A)


       float clangs(char *norm, SuperMatrix *A)


       double zlangs(char *norm, SuperMatrix *A)


       float slangs_64(char *norm, SuperMatrix_64 *A)


       double dlangs_64(char *norm, SuperMatrix_64 *A)


       float clangs_64(char *norm, SuperMatrix_64 *A)


       double zlangs_64(char *norm, SuperMatrix_64 *A)


PURPOSE
       langs  returns the value of the one-norm, Frobenius-norm, the infinity-
       norm, or the element with largest absolute  value  of  a  general  real
       matrix A in sparse format.
       langs returns the value

       norm = 'M' or 'm':            max(abs(A(i,j)))

       norm = '1', 'O' or 'o':       norm1(A)

       norm = 'I' or 'i':            normI(A)

       norm = 'F', 'f', 'E' or 'e':  normF(A)

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
       char *norm (input)
              Specifies the value to be returned in langs as described  above.


       SuperMatrix *A (input/output)
              A  general  matrix  in  sparse  format with dimensions (A->nrow,
              A->ncol).


SEE ALSO
       SuperMatrix

       http://crd.lbl.gov/~xiaoye/SuperLU/

       James W. Demmel, Stanley C. Eisenstat, John R. Gilbert,  Xiaoye  S.  Li
       and  Joseph  W. H. Liu, "A supernodal approach to sparse partial pivot-
       ing", SIAM J. Matrix Analysis and Applications, Vol. 20, Num. 3,  1999,
       pp. 720-755.



                                  7 Nov 2015                         langs(3P)