Returns the approximation of the norm of Z.
Math387
the approximation of the norm of complex number: |Z| = abs(Z.Re) + abs(Z.Im).
The following relations are true: (CAbs(Z1) < CAbs(Z2)) < = > (CAbs1(Z1) < CAbs1(Z2)) and (CAbs(Z1) > CAbs(Z2)) < = > (CAbs1(Z1) > CAbs1(Z2)). This function can be used to speed up comparing operations between complex numbers.
Functions
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