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Source for wiki ComplexRepresentations version 8

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cowan

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98.14.173.81

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ComplexRepresentations

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How a variety of Schemes represent complex numbers:

Exact, inexact, and mixed complex number representations, where inexact and mixed numbers that are `=` are nevertheless distinct in the sense of `eqv?`: Gambit, Chibi.  (Also CLISP, Pure.)

Exact, inexact, and mixed complex number representations, where inexact and mixed numbers that are `=` are the same in the sense of `eqv?`: MIT, STklos.

Exact and inexact complex number representations only (mixed complex numbers become inexact): Racket, Chicken with the numbers egg, Scheme48/scsh, Kawa, Chez, Vicare, Larceny, Ypsilon, !IronScheme, Spark, Wraith.  (Also ABCL, Allegro CL, Clozure CL, CMUCL, ECL, GNU CL, !LispWorks, SBCL, Scieneer CL.)

Inexact complex number representations only: Gauche, Guile, SISC, SCM, KSi, Scheme 7, UMB, Stalin.  (Also Fortran, C/C++, Python, etc.)

Exact complex number representations only: Owl Lisp (which has no inexact numbers).

No complex numbers: plain Chicken, Bigloo, Ikarus, NexJ, !SigScheme, Shoe, !TinyScheme, Scheme 9, Dream, RScheme, BDC, XLisp, Rep, Schemik, Elk, VX, Oaklisp, Llava, SXM, Sizzle, !FemtoLisp, Dfsch, Inlab.

Mosh has a bug whereby numbers that are `=` are always `eqv?` even if they differ in exactness; it supports exact, inexact, and mixed complex number representations, but doesn't differentiate exact from inexact properly.

See also NumericTower.

time

2012-07-16 01:21:25