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Re: Re: learnpython.org - an online interactive Python tutorial

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Date Sun, 24 Apr 2011 07:16:15 -0400
From Dave Angel <davea@ieee.org>
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Subject Re: Re: learnpython.org - an online interactive Python tutorial
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On 01/-10/-28163 02:59 PM, harrismh777 wrote:
> Cameron Simpson wrote:
>> | folks are not aware that 'bc' also has arbitrary precision floating
>> | point math and a standard math library.
>>
>> Floating point math? I thought, historically at least, that bc is built
>> on dc (arbitrary precision integer math, reverse polish syntax) and that
>> consequently bc uses fixed point math rather than floating point.
>
> My bad... I don't mean under-the-covers... I mean that the user may
> calculate arbitrary precision floating arithmetic ... bc keeps track of
> the decimal point and displays the number of digits the user specifies;
> arbitrary precision calculator. (loose language, sorry)
>
> On a *nix system, Mac OSx, Linux, run this to get 1000+ digits of PI:
>
> time echo "scale = 1010; 16 * a(1/5) - 4 * a(1/239)" |bc -lq
>
>
>
> scale sets the precision, -lq loads the math library arctan() quiet.
>
>
>

Wouldn't it be shorter to say:

time echo "scale = 1010;  4 * a(1)" |bc -lq

DaveA

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learnpython.org - an online interactive Python tutorial Ron <ron.reiter@gmail.com> - 2011-04-20 10:15 -0700
  Re: learnpython.org - an online interactive Python tutorial Matty Sarro <msarro@gmail.com> - 2011-04-20 13:57 -0400
  Re: learnpython.org - an online interactive Python tutorial Terry Reedy <tjreedy@udel.edu> - 2011-04-20 18:12 -0400
  Re: learnpython.org - an online interactive Python tutorial Chris Angelico <rosuav@gmail.com> - 2011-04-21 14:07 +1000
  Re: learnpython.org - an online interactive Python tutorial Algis Kabaila <akabaila@pcug.org.au> - 2011-04-21 17:10 +1000
    Re: learnpython.org - an online interactive Python tutorial harrismh777 <harrismh777@charter.net> - 2011-04-21 02:29 -0500
  Re: learnpython.org - an online interactive Python tutorial Chris Angelico <rosuav@gmail.com> - 2011-04-21 17:19 +1000
  Re: learnpython.org - an online interactive Python tutorial Heiko Wundram <modelnine@modelnine.org> - 2011-04-21 09:30 +0200
    Re: learnpython.org - an online interactive Python tutorial harrismh777 <harrismh777@charter.net> - 2011-04-22 01:38 -0500
      Re: learnpython.org - an online interactive Python tutorial Chris Angelico <rosuav@gmail.com> - 2011-04-22 17:08 +1000
        Re: learnpython.org - an online interactive Python tutorial harrismh777 <harrismh777@charter.net> - 2011-04-23 19:37 -0500
          Re: learnpython.org - an online interactive Python tutorial Cameron Simpson <cs@zip.com.au> - 2011-04-24 12:23 +1000
            Re: learnpython.org - an online interactive Python tutorial harrismh777 <harrismh777@charter.net> - 2011-04-23 21:39 -0500
              Re: Re: learnpython.org - an online interactive Python tutorial Dave Angel <davea@ieee.org> - 2011-04-24 07:16 -0400
                Re: learnpython.org - an online interactive Python tutorial harrismh777 <harrismh777@charter.net> - 2011-04-25 01:14 -0500
      Re: learnpython.org - an online interactive Python tutorial Mel <mwilson@the-wire.com> - 2011-04-22 09:07 -0400
        Re: learnpython.org - an online interactive Python tutorial Roy Smith <roy@panix.com> - 2011-04-22 09:22 -0400
      Re: learnpython.org - an online interactive Python tutorial Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2011-04-22 23:28 -0700
        Re: learnpython.org - an online interactive Python tutorial flebber <flebber.crue@gmail.com> - 2011-04-23 05:49 -0700
          Re: learnpython.org - an online interactive Python tutorial Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2011-04-23 11:01 -0700
        Re: learnpython.org - an online interactive Python tutorial rantingrick <rantingrick@gmail.com> - 2011-04-23 08:16 -0700
      Re: learnpython.org - an online interactive Python tutorial rantingrick <rantingrick@gmail.com> - 2011-04-23 08:21 -0700
      Re: learnpython.org - an online interactive Python tutorial Dotan Cohen <dotancohen@gmail.com> - 2011-04-23 19:51 +0300
      Re: learnpython.org - an online interactive Python tutorial Tim Chase <python.list@tim.thechases.com> - 2011-04-23 12:25 -0500
      Re: learnpython.org - an online interactive Python tutorial Westley Martínez <anikom15@gmail.com> - 2011-04-23 12:38 -0700
      Re: learnpython.org - an online interactive Python tutorial Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2011-04-24 00:42 +0000
        Re: learnpython.org - an online interactive Python tutorial Chris Angelico <rosuav@gmail.com> - 2011-04-24 11:35 +1000
          Re: learnpython.org - an online interactive Python tutorial Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2011-04-24 08:13 +0000
            Re: learnpython.org - an online interactive Python tutorial Chris Angelico <rosuav@gmail.com> - 2011-04-24 18:21 +1000
        Re: learnpython.org - an online interactive Python tutorial harrismh777 <harrismh777@charter.net> - 2011-04-23 22:10 -0500
          Re: learnpython.org - an online interactive Python tutorial Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2011-04-24 09:18 +0000
            Re: learnpython.org - an online interactive Python tutorial harrismh777 <harrismh777@charter.net> - 2011-04-25 01:20 -0500
              Re: learnpython.org - an online interactive Python tutorial Terry Reedy <tjreedy@udel.edu> - 2011-04-25 11:43 -0400
              Re: learnpython.org - an online interactive Python tutorial Gregory Ewing <greg.ewing@canterbury.ac.nz> - 2011-04-26 13:06 +1200
          Re: learnpython.org - an online interactive Python tutorial jmfauth <wxjmfauth@gmail.com> - 2011-04-24 08:15 -0700
  Re: learnpython.org - an online interactive Python tutorial Westley Martínez <anikom15@gmail.com> - 2011-04-21 07:14 -0700
  Re: learnpython.org - an online interactive Python tutorial MRAB <python@mrabarnett.plus.com> - 2011-04-21 17:13 +0100
  Re: learnpython.org - an online interactive Python tutorial Dotan Cohen <dotancohen@gmail.com> - 2011-04-23 16:45 +0300

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