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function test35
%TEST35 test GrB_*_extractTuples
% SuiteSparse:GraphBLAS, Timothy A. Davis, (c) 2017-2022, All Rights Reserved.
% SPDX-License-Identifier: Apache-2.0
fprintf ('\n test35 ---------------------- quick test of GrB_extractTuples\n') ;
Prob = ssget ('HB/west0067') ;
A = Prob.A ;
[I1, J1, X1] = find (A) ;
[I2, J2, X2] = GB_mex_extractTuples (A) ;
assert (isequal (I1, double (I2+1)))
assert (isequal (J1, double (J2+1)))
assert (isequal (X1, X2))
Prob = ssget (2662) ;
A = Prob.A ;
% add some dense columns
n = size (A,2) ;
J = randperm (n, 20) ;
A (:,J) = 77 ;
% warmup
[I1, J1, X1] = find (A) ;
tic
[I1, J1, X1] = find (A) ;
tm = toc ;
fprintf ('built-in [i,j,x]=find(A) time: %g\n', tm) ;
nthreads_max = 2*GB_mex_omp_max_threads ;
save = nthreads_get ;
t1 = 0 ;
for nthreads = [1 2 4 8 16 20 32 40 64 128 260 256]
if (nthreads > nthreads_max)
break ;
end
nthreads_set (nthreads) ;
% warmup
[I2, J2, X2] = GB_mex_extractTuples (A) ;
% for timing
tic
[I2, J2, X2] = GB_mex_extractTuples (A) ;
t = toc ;
if (nthreads == 1)
t1 = t ;
end
fprintf ('nthreads %3d speedup vs built-in: %10.4f vs GrB: %10.4f\n', ...
nthreads, tm/t, t1/t) ;
assert (isequal (I1, double (I2+1)))
assert (isequal (J1, double (J2+1)))
assert (isequal (X1, X2))
end
nthreads_set (save) ;
fprintf ('\ntest35: all tests passed\n') ;
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