function x = test_sparse53
a = rand(200,100);
b = rand(100,300);
c = rand(200,100);
d = rand(100,300);
a(a>0.1) = 0;
b(b>0.1) = 0;
c(c>0.1) = 0;
d(d>0.1) = 0;
f = a + i*c;
g = b + i*d;
h = f*g;
F = sparse(f);
H = F*g;
x = testeq(h,H);