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Groups > comp.misc > #2682 > unrolled thread

Calculator Accuracy

Started byGordon Henderson <gordon+usenet@drogon.net>
First post2014-05-08 07:00 +0000
Last post2014-07-25 20:26 -0700
Articles 4 on this page of 44 — 20 participants

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  Calculator Accuracy Gordon Henderson <gordon+usenet@drogon.net> - 2014-05-08 07:00 +0000
    Re: Calculator Accuracy David Hume <David.Hume@example.com> - 2014-05-08 08:39 +0100
    Re: Calculator Accuracy Andy Burns <usenet.feb2014@adslpipe.co.uk> - 2014-05-08 09:14 +0100
      Re: Calculator Accuracy Andy Burns <usenet.feb2014@adslpipe.co.uk> - 2014-05-12 19:02 +0100
    Re: Calculator Accuracy "BartC" <bc@freeuk.com> - 2014-05-08 09:43 +0100
      Re: Calculator Accuracy Tim Streater <timstreater@greenbee.net> - 2014-05-08 09:53 +0100
        Re: Calculator Accuracy "BartC" <bc@freeuk.com> - 2014-05-08 10:22 +0100
          Re: Calculator Accuracy David Hume <David.Hume@example.com> - 2014-05-08 12:17 +0100
            Re: Calculator Accuracy RS Wood <rsw@therandymon.com> - 2014-05-08 14:09 +0000
              Re: Calculator Accuracy David Hume <David.Hume@example.com> - 2014-05-08 16:04 +0100
              Re: Calculator Accuracy Rich <rich@example.com> - 2014-05-08 16:49 +0000
                Re: Calculator Accuracy Rich <rich@example.com> - 2014-05-09 00:03 +0000
              Re: Calculator Accuracy Rich <rich@example.com> - 2014-05-09 00:10 +0000
                Re: Calculator Accuracy RS Wood <rsw@therandymon.com> - 2014-05-09 21:32 +0000
                  Re: Calculator Accuracy Rich <rich@example.com> - 2014-05-10 03:30 +0000
              Re: Calculator Accuracy "G. Paul Ziemba" <paul+usenet@w6yx.stanford.edu> - 2014-05-09 03:43 +0000
      Re: Calculator Accuracy David Hume <David.Hume@example.com> - 2014-05-08 10:55 +0100
        Re: Calculator Accuracy "BartC" <bc@freeuk.com> - 2014-05-08 11:23 +0100
        Re: Calculator Accuracy Hils <hils@saynotospam.net> - 2014-05-08 12:09 +0100
          Re: Calculator Accuracy Hils <hils@saynotospam.net> - 2014-05-08 23:02 +0100
            Re: Calculator Accuracy Marc Auslander <marcslists@gmail.NOSPAM.com> - 2014-05-08 19:51 -0400
              Re: Calculator Accuracy Will Honea <whonea@whonea.net> - 2014-05-08 18:19 -0600
          Re: Calculator Accuracy Eric Pozharski <whynot@pozharski.name> - 2014-05-09 15:19 +0300
            Re: Calculator Accuracy David Hume <David.Hume@example.com> - 2014-05-09 19:06 +0100
              Re: Calculator Accuracy Eric Pozharski <whynot@pozharski.name> - 2014-05-10 08:38 +0300
                Re: Calculator Accuracy Eric Pozharski <whynot@pozharski.name> - 2014-05-12 09:30 +0300
            Re: Calculator Accuracy David Hume <David.Hume@example.com> - 2014-05-10 00:00 +0100
        Re: Calculator Accuracy Rich <rich@example.com> - 2014-05-08 11:40 +0000
    Re: Calculator Accuracy Rich <rich@example.com> - 2014-05-08 11:32 +0000
    Re: Calculator Accuracy Anssi Saari <as@sci.fi> - 2014-05-08 20:20 +0300
      Re: Calculator Accuracy Gordon Henderson <gordon+usenet@drogon.net> - 2014-05-08 17:40 +0000
        Re: Calculator Accuracy David Hume <David.Hume@example.com> - 2014-05-09 08:43 +0100
          Re: Calculator Accuracy Rich <rich@example.com> - 2014-05-09 10:42 +0000
          Re: Calculator Accuracy Whiskers <catwheezel@operamail.com> - 2014-05-09 21:56 +0100
        Re: Calculator Accuracy Geoff Clare <geoff@clare.See-My-Signature.invalid> - 2014-05-12 13:50 +0100
    Re: Calculator Accuracy Caecilius <nospam@spamless.invalid> - 2014-05-08 19:34 +0100
    Re: Calculator Accuracy Caecilius <nospam@spamless.invalid> - 2014-05-08 19:38 +0100
      Re: Calculator Accuracy Hils <hils@saynotospam.net> - 2014-05-08 22:06 +0100
    Re: Calculator Accuracy Paul Sture <nospam@sture.ch> - 2014-05-10 21:24 +0200
    Re: Calculator Accuracy Lewis <g.kreme@gmail.com.dontsendmecopies> - 2014-05-11 16:22 +0000
      Re: Calculator Accuracy Will Honea <whonea@whonea.net> - 2014-05-11 15:41 -0600
        Re: Calculator Accuracy Tim Streater <timstreater@greenbee.net> - 2014-05-11 23:02 +0100
    Re: Calculator Accuracy David Harmon <source@netcom.com> - 2014-05-12 18:20 -0700
    Re: Calculator Accuracy Yeechang Lee <ylee@pobox.com> - 2014-07-25 20:26 -0700

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#2750

FromWill Honea <whonea@whonea.net>
Date2014-05-11 15:41 -0600
Message-ID<m8Sbv.99333$QE3.58804@fx16.iad>
In reply to#2746
Lewis wrote:

> What was the cut-off for suitability?
> 

For all practical purposes, you quit caring when you approach the 
repeatability of the diameter of a cotton ball measured with calipers (or, 
for aerodynamic purposes, the effect of a mouse-fart in a hurricane).  In 
real world use, I always had more use for a gauge that read to the 
resolution of the input and spent many hours educating students about the 
difference between "precision" and "accuracy". 

-- 
Will Honea

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#2751

FromTim Streater <timstreater@greenbee.net>
Date2014-05-11 23:02 +0100
Message-ID<110520142302207207%timstreater@greenbee.net>
In reply to#2750
In article <m8Sbv.99333$QE3.58804@fx16.iad>, Will Honea
<whonea@whonea.net> wrote:

> Lewis wrote:
> 
> > What was the cut-off for suitability?

> For all practical purposes, you quit caring when you approach the 
> repeatability of the diameter of a cotton ball measured with calipers (or, 
> for aerodynamic purposes, the effect of a mouse-fart in a hurricane).  In 
> real world use, I always had more use for a gauge that read to the 
> resolution of the input and spent many hours educating students about the 
> difference between "precision" and "accuracy".

And the difference between systematic and measurement errors too, I
hope.

-- 
"I am enclosing two tickets to the first night of my new play; bring a
friend.... if you have one." - GB Shaw to Churchill "Cannot possibly
attend first night, will attend second...  if there is one." - Winston
Churchill, in response.

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#2770

FromDavid Harmon <source@netcom.com>
Date2014-05-12 18:20 -0700
Message-ID<49SdnSAxyvLk7uzOnZ2dnUVZ_jSdnZ2d@earthlink.com>
In reply to#2682
On Thu, 8 May 2014 07:00:23 +0000 (UTC) in comp.misc, Gordon
Henderson <gordon+usenet@drogon.net> wrote,
>Put calculator into degrees mode, enter 45, then push SIN, COS, TAN,
>then the inverses - INV-TAN, INV-COS and INV-SIN - then subtract 45 and
>see what the result is.
>
>With that, you do expect some rounding, but a lot of calculators were
>so far off the mark it was quite incredible.

The Android calculator app I use reports 0. 
Now, how do I tell if that is accuracy or rounding?

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#4151

FromYeechang Lee <ylee@pobox.com>
Date2014-07-25 20:26 -0700
Message-ID<slrnlt67v1.5ab.ylee@pobox.com>
In reply to#2682
Gordon Henderson wrote:
> Put calculator into degrees mode, enter 45, then push SIN, COS, TAN,
> then the inverses - INV-TAN, INV-COS and INV-SIN - then subtract 45 and
> see what the result is.

The OS X 10.9 calculator returns -0.00000000016136, which is close
enough to zero for our purposes.

A calculator for the OS X Dashboard returns 0, which of course could
be rounding.

Orpie for various Unixes returns 5.698552740796e-12.

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