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Re: [Gcl-devel] Re: [Maxima] float to bfloat

From: Raymond Toy
Subject: Re: [Gcl-devel] Re: [Maxima] float to bfloat
Date: Fri, 23 Jan 2004 11:22:49 -0500
User-agent: Gnus/5.1002 (Gnus v5.10.2) XEmacs/21.5 (celeriac, usg-unix-v)

>>>>> "Camm" == Camm Maguire <address@hidden> writes:

    Camm> I don't think this is the case:

My apologies.  I didn't test it.  I used to have problems with gcl's
float reader/printer, but I guess you've fixed those.  Nice!

    Camm> OK, will consider after Stavros gets a chance to look into things next
    Camm> week.  Thanks again to all!

FWIW, I ran your test function on cmucl.  It passes the test case
(test-f 1d0 10).  Also, there were a couple of minor bugs.  float
should take the 2nd arg, otherwise it converts to single-float be
default.  This was messing up cmucl. :-)

(defun test-f (x i)
      (q r s)
      (integer-decode-float x)
    (format t "~S~%" x)
    (and (eql x (float (* q (expt 2 r)) x))
         (eql (float (rationalize x) x) x)
         (if (> i 0)
             (test-f (float (* (+ q 1) (expt 2 r)) x) (- i 1))


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