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function test47
%TEST47 prformance test of GrB_vxm
% SuiteSparse:GraphBLAS, Timothy A. Davis, (c) 2017-2022, All Rights Reserved.
% SPDX-License-Identifier: Apache-2.0
rng ('default') ;
% d = struct ('inp1', 'tran', 'inp0', 'tran') ;
Prob = ssget (939) ;
% Prob = ssget (2662) ;
A = Prob.A ;
n = size (A,1) ;
A (1,2) = 1 ;
w = sparse (n,1) ;
semiring.multiply = 'times' ;
semiring.add = 'plus' ;
semiring.class = 'double' ;
t3 = 0 ;
Xnz = [ ] ;
T = [ ]
d2.axb = 'dot' ;
for xnz = [100:100:1000 2000:1000:72000]
x = sprand (n, 1, xnz/n) ;
tic
c1 = GB_mex_vxm (w, [],[], semiring, x, A, [ ]) ;
t = toc ;
tic
c2 = GB_mex_vxm (w, [],[], semiring, x, A, d2) ;
t2 = toc ;
tic
c0 = x'*A ;
tm = toc ;
assert (isequal (c0', c1.matrix)) ;
Xnz = [Xnz nnz(x)] ;
T = [T t] ;
fprintf ('%5d : %10g(%s) %10g built-in %10g speedup %10g %10g\n', ...
nnz(x), t, method (1), t2, tm, tm/t, tm/t2) ;
end
fprintf ('\ntest47: all tests passed\n') ;
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