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HPL_pdlange(3)		     HPL Library Functions		HPL_pdlange(3)

NAME
       HPL_pdlange - Compute ||A||.

SYNOPSIS
       #include	"hpl.h"

       double  HPL_pdlange(  const  HPL_T_grid	* GRID,	const HPL_T_NORM NORM,
       const int M, const int N, const int NB, const double * A, const int LDA
       );

DESCRIPTION
       HPL_pdlange  returns  the value of the one norm,	 or the	infinity norm,
       or the element of largest absolute value	of a distributed matrix	A:

	  max(abs(A(i,j))) when	NORM = HPL_NORM_A,
	  norm1(A),	   when	NORM = HPL_NORM_1,
	  normI(A),	   when	NORM = HPL_NORM_I,

       where norm1 denotes the one norm	of a matrix (maximum column  sum)  and
       normI  denotes	the infinity norm of a matrix (maximum row sum).  Note
       that max(abs(A(i,j))) is	not a matrix norm.

ARGUMENTS
       GRID    (local input)	       const HPL_T_grid	*
	       On entry,  GRID	points	to the data structure  containing  the
	       process grid information.

       NORM    (global input)	       const HPL_T_NORM
	       On  entry,   NORM  specifies  the  value	to be returned by this
	       function	as described above.

       M       (global input)	       const int
	       On entry,  M  specifies	the number  of rows of the  matrix  A.
	       M must be at least zero.

       N       (global input)	       const int
	       On  entry,   N specifies	the number of columns of the matrix A.
	       N must be at least zero.

       NB      (global input)	       const int
	       On entry,  NB specifies the blocking factor used	 to  partition
	       and distribute the matrix. NB must be larger than one.

       A       (local input)	       const double *
	       On  entry,   A  points to an array of dimension	(LDA,LocQ(N)),
	       that contains the local pieces of the distributed matrix	A.

       LDA     (local input)	       const int
	       On entry, LDA specifies the leading dimension of	the  array  A.
	       LDA must	be at least max(1,LocP(M)).

SEE ALSO
       HPL_pdlaprnt (3), HPL_fprintf (3).

HPL 2.1			       October 26, 2012			HPL_pdlange(3)

NAME | SYNOPSIS | DESCRIPTION | ARGUMENTS | SEE ALSO

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