picking those matrices whose determinant is greater than 0

I have many matrices and I need to pick only those matrices whose determinant is greater than zero. For instance, consider the simple code which generates square matrices and evaluate its determinant. How can i display only those matrices whose determiant is greater than zero.

for i=1:5
    a=rand(i)
    b=det(a)
end

Any help will be appreciated.

Answer 1

[John D'Errico]

WTP?

if b > 0
  disp(a)
end

[tanveer haq]

thank you John D'Errico. It worked.