Let's say a real number "ought to be zero" if its absolute value is <: the 
comparison tolerance 2^_44 .  Write a verb "clean" that replaces real numbers 
that ought to be zero with zero.  How would you clean a complex number?

    1 o. 1r2p1 * i. 5
 0 1 1.22465e_16 _1 _2.44929e_16
    clean 1 o. 1r2p1 * i. 5
 0 1 0 _1 0
 
    ^ 0j1 * 1r2p1 * i. 5
 1 6.12323e_17j1 _1j1.22465e_16 _1.83697e_16j_1 1j_2.44929e_16
    clean ^ 0j1 * 1r2p1 * i. 5
 1 0j1 _1 0j_1 1

--Kip Murray

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