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| Date: Fri, 14 Oct 2005 15:26:46 -0400 | From: "John.Cowan" <jcowan@xxxxxxxxxxxxxxxxx> | | Aubrey Jaffer scripsit: | | > What is the rationale for mandating exact rationals? Over 15 years I | > have written numerical Scheme code for everything from symbolic | > algebra to Galois fields to linear systems to optics simulations | > without needing exact rationals. | > | > A case could be made if (expt -26. 1/3) returned -2.9624960684073702; | > but I know of no Scheme implementation that does so. | | Why would that be desirable? Because it is the cube root of -26. A better example is: (expt -27 1/3) ==> -3 | 1.48124803420369+2.5655968538523i | (thus Chicken, and Petite Chez just adds a few more significant digits) | is a more sensible value.