Biep scripsit: > But in that case the equations for make-polar are false, aren't they? > z may be exact on input and inexact on output.
Well, yes. But that point is made immediately thereafter, and extends only to the representation of numbers as exact or inexact, not to the numbers themselves. Furthermore, it is not a necessary truth: Pure (which shares Scheme's numeric tower) has both rectangular and polar representations of complex numbers internally, so the equivalent of (make-polar x3 x4), namely x3 <: x4, can return an exact value for exact arguments in the appropriate range. -- John Cowan [email protected] At times of peril or dubitation, http://www.ccil.org/~cowan Perform swift circular ambulation, With loud and high-pitched ululation. _______________________________________________ Scheme-reports mailing list [email protected] http://lists.scheme-reports.org/cgi-bin/mailman/listinfo/scheme-reports
