Re: online gravitational field line explorer...

From	Dr J R Stockton <reply1300@merlyn.demon.co.uk.invalid>
Newsgroups	comp.lang.javascript
Subject	Re: online gravitational field line explorer...
Date	2013-11-25 20:47 +0000
Organization	Home
Message-ID	<K0ZkWM4Hd7kSFwAS@invalid.uk.co.demon.merlyn.invalid> (permalink)
References	<l6eopc$2qr$1@speranza.aioe.org> <l6ogfd$5h2$1@speranza.aioe.org> <FwpnXI5EDPkSFwA5@invalid.uk.co.demon.merlyn.invalid> <l6trl6$640$1@speranza.aioe.org>

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In comp.lang.javascript message <l6trl6$640$1@speranza.aioe.org>, Sun,
24 Nov 2013 13:38:50, Chris M. Thomasson <no@spam.invalid> posted:

>> "Dr J R Stockton"  wrote in message
>> news:FwpnXI5EDPkSFwA5@invalid.uk.co.demon.merlyn.invalid...
>
>>> In comp.lang.javascript message
>>> <l6ogfd$5h2$1@speranza.aioe.org>, Fri,
>>> 22 Nov 2013 12:56:49, Chris M. Thomasson
>>> <no@spam.invalid> posted:
>
>
>>> However, I am still allowing for so called "negative" mass points. I know
>>> its not allowed within the realm of a gravitational field scheme,
>>>but  since
>>> the end result of rendering seems to be so "related" to negative
>>>electrical
>>> charges, I have decide to keep it around. I was thinking of reporting
>>> an error
>>> in the user settings for negative mass points.
>
>
>> You should put a checkbox or a pair of radio-buttons to determine
>> whether a negative value is allowed, and also allow the user to
>> determine whether legends should be gravitational or electrical or
>> magnetic.
>
>Basically, you have read a part of my mind Dr. Stockton!
>
>:^)
>
>
>FWIW, and IMVVHO, I prefer checkboxes because an "all checks
>cleared" condition can be used to trigger a "unique state of action".
>As for radio buttons, lets say two of them, there are only two states.
>AFAICT, with checkboxes, there are three states, therefore one can
>possibly save some UI real estate  here?

Basically, a checkbox and a pair of radiobuttons, if initialised
appropriately, are equivalent.  But, in some cases, one may be easier to
label nicely than the other.

With radiobuttons, one can initialise to neither/none being on, or, for
purists, to a hidden button being on.  That, with a bit of code, can
force the user to _make_ a choice.


>> Have another control to determine whether the total "charge" has to be
>> zero.
>
>You mean have a condition that enforces whether or not all of the
>mass points add to one, or zero? I can see this resulting in a data
>table that can be used for “probability factors” in various algorithms...

The code might as well handle the general case, unless some great
difficulty results.  For electric charges, one can have a non-zero net
charge; but one might want not to.  Practical masses always have a
positive sum.  Magnetic poles always sum to zero, until monopoles are
found.

With radiobuttons, you can provide an extra option, in which the
conditions and legends can be read from, say, a textarea.  Then your
code can be used for purposes that you know nothing about.

-- 
 (c) John Stockton, near London.                Mail ?.?.Stockton@physics.org
  Web  <http://www.merlyn.demon.co.uk/> - FAQish topics, acronyms, and links.

Thread

online gravitational field line explorer... "Chris M. Thomasson" <no@spam.invalid> - 2013-11-18 20:17 -0800
  Re: online gravitational field line explorer... "Chris M. Thomasson" <no@spam.invalid> - 2013-11-18 23:21 -0800
  Re: online gravitational field line explorer... "Evertjan." <exjxw.hannivoort@interxnl.net> - 2013-11-19 09:36 +0000
    Re: online gravitational field line explorer... "Jukka K. Korpela" <jkorpela@cs.tut.fi> - 2013-11-19 12:10 +0200
      Re: online gravitational field line explorer... "Evertjan." <exjxw.hannivoort@interxnl.net> - 2013-11-19 11:01 +0000
        Re: online gravitational field line explorer... "Jukka K. Korpela" <jkorpela@cs.tut.fi> - 2013-11-19 13:33 +0200
          Re: online gravitational field line explorer... "Michael Haufe (TNO)" <tno@thenewobjective.com> - 2013-11-19 07:44 -0800
            Re: online gravitational field line explorer... Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2013-11-19 16:53 +0100
            Re: online gravitational field line explorer... "Chris M. Thomasson" <no@spam.invalid> - 2013-11-19 12:03 -0800
      Re: online gravitational field line explorer... John Harris <niam@jghnorth.org.uk.invalid> - 2013-11-19 16:11 +0000
        Re: online gravitational field line explorer... "Jukka K. Korpela" <jkorpela@cs.tut.fi> - 2013-11-19 19:21 +0200
          Re: online gravitational field line explorer... John Harris <niam@jghnorth.org.uk.invalid> - 2013-11-20 15:48 +0000
            Re: online gravitational field line explorer... "Jukka K. Korpela" <jkorpela@cs.tut.fi> - 2013-11-20 19:15 +0200
              Re: online gravitational field line explorer... John Harris <niam@jghnorth.org.uk.invalid> - 2013-11-21 20:19 +0000
                Re: online gravitational field line explorer... "Jukka K. Korpela" <jkorpela@cs.tut.fi> - 2013-11-21 22:52 +0200
                Re: online gravitational field line explorer... John Harris <niam@jghnorth.org.uk.invalid> - 2013-11-22 17:33 +0000
                Re: online gravitational field line explorer... "Jukka K. Korpela" <jkorpela@cs.tut.fi> - 2013-11-22 19:50 +0200
                Re: online gravitational field line explorer... John Harris <niam@jghnorth.org.uk.invalid> - 2013-11-23 14:17 +0000
                Dollar sign in identifier names (was: online gravitational field line explorer...) Christoph Michael Becker <cmbecker69@arcor.de> - 2013-11-22 19:49 +0100
                Re: online gravitational field line explorer... Eric Bednarz <bednarz@fahr-zur-hoelle.org> - 2013-11-21 22:53 +0100
                Re: online gravitational field line explorer... Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2013-11-21 23:25 +0100
                Re: online gravitational field line explorer... John Harris <niam@jghnorth.org.uk.invalid> - 2013-11-22 16:57 +0000
                Re: online gravitational field line explorer... "Jukka K. Korpela" <jkorpela@cs.tut.fi> - 2013-11-22 19:12 +0200
                Re: online gravitational field line explorer... Christoph Michael Becker <cmbecker69@arcor.de> - 2013-11-22 19:00 +0100
                Re: online gravitational field line explorer... "Jukka K. Korpela" <jkorpela@cs.tut.fi> - 2013-11-22 21:04 +0200
                Re: online gravitational field line explorer... Christoph Michael Becker <cmbecker69@arcor.de> - 2013-11-22 23:46 +0100
                Re: online gravitational field line explorer... Eric Bednarz <bednarz@fahr-zur-hoelle.org> - 2013-11-23 01:21 +0100
                Re: online gravitational field line explorer... Eric Bednarz <bednarz@fahr-zur-hoelle.org> - 2013-11-22 18:49 +0100
                Re: online gravitational field line explorer... Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2013-11-22 20:06 +0100
                Re: online gravitational field line explorer... Eric Bednarz <bednarz@fahr-zur-hoelle.org> - 2013-11-22 22:49 +0100
                Re: online gravitational field line explorer... Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2013-11-22 23:52 +0100
                Re: online gravitational field line explorer... Eric Bednarz <bednarz@fahr-zur-hoelle.org> - 2013-11-23 01:40 +0100
    Re: online gravitational field line explorer... "Chris M. Thomasson" <no@spam.invalid> - 2013-11-19 12:05 -0800
  Re: online gravitational field line explorer... Tiger Sharktopus <tigersharktopus@gmail.com> - 2013-11-19 15:54 -0800
    Re: online gravitational field line explorer... "Chris M. Thomasson" <no@spam.invalid> - 2013-11-21 06:17 -0800
  Re: online gravitational field line explorer... Dr J R Stockton <reply1300@merlyn.demon.co.uk.invalid> - 2013-11-20 19:47 +0000
    Re: online gravitational field line explorer... "Michael Haufe (TNO)" <tno@thenewobjective.com> - 2013-11-20 17:43 -0800
  Re: online gravitational field line explorer... "Chris M. Thomasson" <no@spam.invalid> - 2013-11-21 06:58 -0800
  Re: online gravitational field line explorer... "Chris M. Thomasson" <no@spam.invalid> - 2013-11-22 12:56 -0800
    Re: online gravitational field line explorer... Dr J R Stockton <reply1300@merlyn.demon.co.uk.invalid> - 2013-11-23 18:15 +0000
      Re: online gravitational field line explorer... "Chris M. Thomasson" <no@spam.invalid> - 2013-11-24 13:38 -0800
        Re: online gravitational field line explorer... Dr J R Stockton <reply1300@merlyn.demon.co.uk.invalid> - 2013-11-25 20:47 +0000
          Re: online gravitational field line explorer... "Chris M. Thomasson" <no@spam.invalid> - 2013-11-25 19:51 -0800
            Re: online gravitational field line explorer... Dr J R Stockton <reply1300@merlyn.demon.co.uk.invalid> - 2013-11-27 20:36 +0000
  Re: online gravitational field line explorer... "Chris M. Thomasson" <no@spam.invalid> - 2013-11-29 20:56 -0800
  Re: online gravitational field line explorer... "Chris M. Thomasson" <no@spam.invalid> - 2013-12-01 19:28 -0800

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