Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > comp.lang.forth > #135398

Re: E.P E. E.EXACT

Date 2026-08-23 12:25 +1000
Subject Re: E.P E. E.EXACT
Newsgroups comp.lang.forth
References (1 earlier) <1156l0r$19nm9$1@dont-email.me> <6a77f77b$1@news.ausics.net> <11592lt$65r8$1@dont-email.me> <nnd$632a7052$6afb2a97@952a43c4d6a59389> <116d931$18ugj$1@dont-email.me>
From dxf <dxforth@gmail.com>
Message-ID <6a8a5a17$1@news.ausics.net> (permalink)
Organization Ausics - https://newsgroups.ausics.net

Show all headers | View raw

On 23/08/2026 8:50 am, marcel hendrix wrote:
> On 8/22/2026 4:43 PM, albert@spenarnc.xs4all.nl wrote:
>> In article <11592lt$65r8$1@dont-email.me>, marcel hendrix  <mhx@iae.nl> wrote:
>>> On 8/9/2026 5:43 AM, dxf wrote:
>>> [..]
>>>> Under VFX and DX-Forth 'decimal places' requires F.R ( F. only does
>>>> 'significant digits' with trailing zeros truncated).  If one asks for
>>>> 200 decimal places it obeys - up to the limit of the HOLD buffer.
>>>
>>> Is there a use case for that behavior or is it just a feature?
>>>
>>> I would expect F.R to print the number with more than what PLACES
>>> is set to, in order to prevent saving and restoring a user variable.
>>> In such a case more than 20 places would be a bit unusual, and one
>>> would need to make sure the extra digits are not total rubbish.
>>
>> Why?
>> All floating point numbers are rubbish from a certain point on,
>> and you have to keep track of that yourself.
>>
>> 1E2
>>   OK
>>   100 F.R
>>   9.9999999999999999982652765240231929055880755186080932617187500000000000000000000000000000000000000000E1  OK
>>
>> Only BASIC programmers don't realize that all fp numbers are inexact,
>> e.g. sin(1^100) may make sense in mathematics, but not the FORTRAN
>>     X= SIN(1E100)
> 
> Sorry, I don't see what point you are making here.
> 
> That ' 1E2 100 F.R ' is would definitely not be my intention.
> 
> FORTH> help f.r
> F.R                 "f-dot-r"                                   IFORTH
>      ( n -- ) ( F: r -- )
>      Display the floating point number r using the conversion rules as
>      for F., right aligned in a field n characters wide. If the number
>      of characters required to display r is greater than n, all digits
>      are displayed with no leading spaces in a field as wide as
>      necessary.
>      When the fieldwidth is too small, F.R and its variants try to
>      squeeze the number in by switching to exponential notation. When
>      that doesn't help, they print a field of asterisks. The switch to
>      exponential notation happens when |r| > 10^PRECISION . When |r| <
>      10^-PRECISION , "0.00.." is printed.
>  2 set-precision  ok
> 1e2 57  f.r                                                    100.00 ok
> 1e2 1   f.r * ok
> 1e2 2   f.r ** ok
> 1e2 3   f.r *** ok
> 1e2 4   f.r **** ok
> 1e2 5   f.r ***** ok
> 1e2 15  f.r          100.00 ok
> 1e2  5  f.r ***** ok
> 1e2 10  f.r     100.00 ok
> 1e2  6  f.r 100.00 ok
> 12 set-precision  ok
> 1e2  6  f.r ****** ok
> 1e2 16  f.r 100.000000000000 ok
> 1e2 20  f.r     100.000000000000 ok

I would consider that more an application than a kernel function due to
the number of variables.

Back to comp.lang.forth | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

E.P E. E.EXACT anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2026-08-05 18:02 +0000
  Re: E.P E. E.EXACT Krishna Myneni <krishna.myneni@ccreweb.org> - 2026-08-06 08:13 -0500
    Re: E.P E. E.EXACT anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2026-08-06 14:00 +0000
      Re: E.P E. E.EXACT Krishna Myneni <krishna.myneni@ccreweb.org> - 2026-08-06 10:45 -0500
        Re: E.P E. E.EXACT anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2026-08-06 15:58 +0000
          Re: E.P E. E.EXACT anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2026-08-06 17:20 +0000
        Re: E.P E. E.EXACT marcel hendrix <mhx@iae.nl> - 2026-08-06 21:05 +0200
          Re: E.P E. E.EXACT anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2026-08-06 20:38 +0000
          Re: E.P E. E.EXACT Krishna Myneni <krishna.myneni@ccreweb.org> - 2026-08-06 18:44 -0500
          Re: E.P E. E.EXACT dxf <dxforth@gmail.com> - 2026-08-07 11:03 +1000
            Re: E.P E. E.EXACT anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2026-08-07 10:11 +0000
              Re: E.P E. E.EXACT dxf <dxforth@gmail.com> - 2026-08-08 14:39 +1000
                Re: E.P E. E.EXACT anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2026-08-08 06:32 +0000
                Re: E.P E. E.EXACT dxf <dxforth@gmail.com> - 2026-08-09 04:50 +1000
                Re: E.P E. E.EXACT dxf <dxforth@gmail.com> - 2026-08-10 20:01 +1000
                Re: E.P E. E.EXACT anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2026-08-10 18:06 +0000
                Re: E.P E. E.EXACT anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2026-08-10 17:24 +0000
                Re: E.P E. E.EXACT dxf <dxforth@gmail.com> - 2026-08-11 14:01 +1000
                Re: E.P E. E.EXACT Krishna Myneni <krishna.myneni@ccreweb.org> - 2026-08-10 22:10 -0500
                Re: E.P E. E.EXACT anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2026-08-11 04:56 +0000
                Re: E.P E. E.EXACT Krishna Myneni <krishna.myneni@ccreweb.org> - 2026-08-11 22:16 -0500
                Re: E.P E. E.EXACT Krishna Myneni <krishna.myneni@ccreweb.org> - 2026-08-12 05:47 -0500
                Re: E.P E. E.EXACT peter <peter.noreply@tin.it> - 2026-08-12 18:03 +0200
                Re: E.P E. E.EXACT Krishna Myneni <krishna.myneni@ccreweb.org> - 2026-08-12 11:48 -0500
                Re: E.P E. E.EXACT marcel hendrix <mhx@iae.nl> - 2026-08-08 09:14 +0200
                Re: E.P E. E.EXACT anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2026-08-08 09:40 +0000
                Re: E.P E. E.EXACT marcel hendrix <mhx@iae.nl> - 2026-08-08 15:26 +0200
                Re: E.P E. E.EXACT anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2026-08-10 16:43 +0000
                Re: E.P E. E.EXACT dxf <dxforth@gmail.com> - 2026-08-09 13:43 +1000
                Re: E.P E. E.EXACT marcel hendrix <mhx@iae.nl> - 2026-08-09 07:19 +0200
                Re: E.P E. E.EXACT dxf <dxforth@gmail.com> - 2026-08-10 19:15 +1000
                Re: E.P E. E.EXACT marcel hendrix <mhx@iae.nl> - 2026-08-10 13:17 +0200
                Re: E.P E. E.EXACT dxf <dxforth@gmail.com> - 2026-08-10 22:59 +1000
                Re: E.P E. E.EXACT dxf <dxforth@gmail.com> - 2026-08-10 23:54 +1000
                Re: E.P E. E.EXACT marcel hendrix <mhx@iae.nl> - 2026-08-10 20:42 +0200
                Re: E.P E. E.EXACT dxf <dxforth@gmail.com> - 2026-08-11 17:10 +1000
                Re: E.P E. E.EXACT dxf <dxforth@gmail.com> - 2026-08-12 14:04 +1000
                Re: E.P E. E.EXACT albert@spenarnc.xs4all.nl - 2026-08-22 16:43 +0200
                Re: E.P E. E.EXACT anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2026-08-22 15:47 +0000
                Re: E.P E. E.EXACT albert@spenarnc.xs4all.nl - 2026-08-22 18:27 +0200
                Re: E.P E. E.EXACT anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2026-08-22 16:40 +0000
                Re: E.P E. E.EXACT albert@spenarnc.xs4all.nl - 2026-08-22 19:42 +0200
                Re: E.P E. E.EXACT anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2026-08-22 18:03 +0000
                Re: E.P E. E.EXACT albert@spenarnc.xs4all.nl - 2026-08-22 22:56 +0200
                Re: E.P E. E.EXACT marcel hendrix <mhx@iae.nl> - 2026-08-23 00:50 +0200
                Re: E.P E. E.EXACT dxf <dxforth@gmail.com> - 2026-08-23 12:25 +1000
                Re: E.P E. E.EXACT Hans Bezemer <the.beez.speaks@gmail.com> - 2026-08-09 14:52 +0200
            Re: E.P E. E.EXACT Krishna Myneni <krishna.myneni@ccreweb.org> - 2026-08-07 07:50 -0500
              Re: E.P E. E.EXACT dxf <dxforth@gmail.com> - 2026-08-08 12:33 +1000
                Re: E.P E. E.EXACT albert@spenarnc.xs4all.nl - 2026-08-22 17:01 +0200
          Re: E.P E. E.EXACT albert@spenarnc.xs4all.nl - 2026-08-22 16:15 +0200

csiph-web