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function C = gb_minbyrow (op, A)
%GB_MINBYROW min, by row
% Implements C = min (A, [ ], 2)
% SuiteSparse:GraphBLAS, Timothy A. Davis, (c) 2017-2022, All Rights Reserved.
% SPDX-License-Identifier: Apache-2.0
% C = min (A, [ ], 2) reduces each row to a scalar; C is m-by-1
C = gbvreduce (op, A) ;
% if C(i) > 0, but if A(i,:) is sparse, then assign C(i) = 0.
ctype = gbtype (C) ;
% d (i) = number of entries in A(i,:); d (i) not present if A(i,:) empty
[m, n] = gbsize (A) ;
d = gbdegree (A, 'row') ;
% d (i) is an explicit zero if A(i,:) has 1 to n-1 entries
d = gbselect (d, '<', int64 (n)) ;
zero = gbnew (0, ctype) ;
if (gbnvals (d) == m)
% all rows A(i,:) have between 1 and n-1 entries
C = gbapply2 (op, C, zero) ;
else
d = gbapply2 (['2nd.' ctype], d, zero) ;
% if d(i) is between 1 and n-1 and C(i) > 0 then C (i) = 0
C = gbeadd (op, C, d) ;
end
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