Greetings! James Amundson <[EMAIL PROTECTED]> writes:
> On Thu, 2002-09-19 at 11:09, Richard Fateman wrote: > > > for i:1 thru 60 do print ([i,is (1.0d0=1.0d0+2^(-i))]); double > > for i:1 thru 60 do print ([i,is (1.0=1.0+2^(-i))]); single > > > > for the first one, you should get i=22 for the first true. > > for the second one, i=53 should be the first true. > > Ah ha. By that test, single precision float are being implemented as > doubles by all three of GCL, Clisp and CMUCL under Linux. > > Camm, what do you get? > Indeed, I get 53 on both. I'm giving Rick Younie's suggestion of -ffloat-store a try. Apparently, the m68k can keep more precision for doubles than standard IEEE dictates. > > The way I debug lisp functions is first to make sure > > the same answer happens when the code is interpreted rather > > than compiled. (if not, it is a compiler error!) > > Then if they are the same, by using trace. You can > > trace the two different versions and see where they > > give different answers. Rarely I > > insert in the lisp code (break "id") or output statements > > like (format t "~% location xx with values ~s ~s " x y) > > > > Which all brings to mind the possibility that suggestions > > like this should be in a FAQ ... How do I debug lisp code > > in Maxima. > > Yes. Absolutely. CY was going to start a Wiki. What happened to it? > (I'll confess that I've never really used a Wiki, but I believe it is > supposed to be a more flexible implementation of a FAQ.) > >From my lowly perspective as a C person, having a tool with the same functionality as gdb for lisp, as is apparently the case as described in Dr. Schelter's docs for dbl mode, but which I have been unable to reproduce, would be *very* attractive for people new to the language. Take care, > --Jim > > -- Camm Maguire [EMAIL PROTECTED] ========================================================================== "The earth is but one country, and mankind its citizens." -- Baha'u'llah
