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//------------------------------------------------------------------------------
// gbnorm: norm (A,kind)
//------------------------------------------------------------------------------
// SuiteSparse:GraphBLAS, Timothy A. Davis, (c) 2017-2022, All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0
//------------------------------------------------------------------------------
#include "gb_interface.h"
#define USAGE "usage: s = gbnorm (A, kind)"
void mexFunction
(
int nargout,
mxArray *pargout [ ],
int nargin,
const mxArray *pargin [ ]
)
{
//--------------------------------------------------------------------------
// check inputs
//--------------------------------------------------------------------------
gb_usage (nargin == 2 && nargout <= 1, USAGE) ;
//--------------------------------------------------------------------------
// get the inputs
//--------------------------------------------------------------------------
GrB_Matrix A = gb_get_shallow (pargin [0]) ;
int64_t norm_kind = gb_norm_kind (pargin [1]) ;
GrB_Type atype ;
OK (GxB_Matrix_type (&atype, A)) ;
GrB_Index anrows, ancols ;
OK (GrB_Matrix_nrows (&anrows, A)) ;
OK (GrB_Matrix_ncols (&ancols, A)) ;
int sparsity ;
OK (GxB_Matrix_Option_get (A, GxB_SPARSITY_STATUS, &sparsity)) ;
//--------------------------------------------------------------------------
// s = norm (A,kind)
//--------------------------------------------------------------------------
double s ;
if (norm_kind == INT64_MIN && !GB_is_dense (A))
{
// norm (A,-inf) is zero if A is not full
s = 0 ;
}
else if ((atype == GrB_FP32 || atype == GrB_FP64)
&& (sparsity != GxB_BITMAP)
&& (anrows == 1 || ancols == 1 || norm_kind == 0))
{
// s = norm (A,p) where A is an FP32 or FP64 vector,
// or when p = 0 (for Frobenius norm). A cannot be bitmap.
GrB_Index anz ;
OK (GrB_Matrix_nvals (&anz, A)) ;
s = GB_helper10 (A->x, A->iso, NULL, false, atype, norm_kind, anz) ;
if (s < 0) ERROR ("unknown norm") ;
}
else
{
// s = norm (A, norm_kind)
s = gb_norm (A, norm_kind) ;
}
//--------------------------------------------------------------------------
// free workspace and return result
//--------------------------------------------------------------------------
OK (GrB_Matrix_free (&A)) ;
pargout [0] = mxCreateDoubleScalar (s) ;
GB_WRAPUP ;
}
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