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Re: [Chicken-users] From inexact to exact using the "-" procedure?
From: |
John Cowan |
Subject: |
Re: [Chicken-users] From inexact to exact using the "-" procedure? |
Date: |
Fri, 23 Mar 2012 16:41:07 -0400 |
User-agent: |
Mutt/1.5.18 (2008-05-17) |
Jeronimo Pellegrini scripsit:
> #;5> (- a b)
> 1.0
The imaginary part vanishes because R5RS treats 1.0+0.0i as a real number.
However, R6RS does not and R7RS currently does not either, though that
may change as a result of a current debate. The rationale is that you
don't know if the complex number is actually on the real line or just
too close to it to discriminate.
--
Overhead, without any fuss, the stars were going out.
--Arthur C. Clarke, "The Nine Billion Names of God"
John Cowan <address@hidden>