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Groups > comp.lang.javascript > #30658
| From | Thomas 'PointedEars' Lahn <PointedEars@web.de> |
|---|---|
| Newsgroups | comp.lang.javascript |
| Subject | Re: Impact of implicit arrays... |
| Followup-To | poster |
| Date | 2016-06-15 06:55 +0200 |
| Organization | PointedEars Software (PES) |
| Message-ID | <2043638.uQNA3CLBAW@PointedEars.de> (permalink) |
| References | <njhj52$hl3$1@gioia.aioe.org> <4a1c28ea-447b-4e9b-9c75-68ef85c379e7@googlegroups.com> <njq6qn$qc3$1@gioia.aioe.org> |
Followups directed to: poster
Chris M. Thomasson wrote:
> Also, we can do this another way that involves an explicit
> output parameter to the function. Something like:
> _______________________________________
> function ct_complex_mul(c0, c1, out)
^^^
> {
> out[0] = c0[0] * c1[0] - c0[1] * c1[1];
> out[1] = c0[0] * c1[1] + c0[1] * c1[0];
>
> return out;
> }
> _______________________________________
>
>
> To call it in a loop could look like:
> _______________________________________
> function foo_with_out()
> {
> var out = [0, 0];
> var z = [1, 1];
> var c = [2, 2];
>
> for (var i = 0; i < 10; ++i)
> {
> out = ct_complex_mul(z, c);
^^
> z[0] = out[0];
> z[1] = out[1];
> }
> }
> _______________________________________
No, that would be pointless. In fact, the function SHOULD NOT *return* the
changed value then.
But this non-idempotent, non-reentrant code is not thread-safe – it is not
suited for animations.
>> Another thought is to switch to polar coordinates
>> instead of Cartesian coordinates as it would simplify
>> multiplication and division at least. With fractal based
>> work this might be more intuitive anyway, yes?
>
> Right. However, I think that converting Polar into Cartesian
> in order to add/subtract is the simplest route correct?
Yes. UTSL.
The “From” and “Reply-To” header fields of your postings are borked, see
<http://www.interhack.net/pubs/munging-harmful/>
<http://tools.ietf.org/html/rfc5536#section-3.1.2>
<http://tools.ietf.org/html/rfc5536#section-3.2>
You should also avoid the troll server, aioe.org.
Pseudo-address added to killfile.
F'up2 poster
--
PointedEars
FAQ: <http://PointedEars.de/faq> | SVN: <http://PointedEars.de/wsvn/>
Twitter: @PointedEars2 | ES Matrix: <http://PointedEars.de/es-matrix>
Please do not cc me. / Bitte keine Kopien per E-Mail.
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Impact of implicit arrays... "Chris M. Thomasson" <nospam@nospam.com> - 2016-06-11 10:52 -0700
Re: Impact of implicit arrays... Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2016-06-12 12:16 +0200
Re: Impact of implicit arrays... "Chris M. Thomasson" <nospam@nospam.com> - 2016-06-13 12:23 -0700
Re: Impact of implicit arrays... "Michael Haufe (TNO)" <tno@thenewobjective.com> - 2016-06-13 22:00 -0700
Re: Impact of implicit arrays... "Chris M. Thomasson" <nospam@nospam.com> - 2016-06-14 17:17 -0700
Re: Impact of implicit arrays... Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2016-06-15 06:55 +0200
Re: Impact of implicit arrays... "Chris M. Thomasson" <nospam@nospam.invalid> - 2016-06-14 22:19 -0700
Re: Impact of implicit arrays... "Michael Haufe (TNO)" <tno@thenewobjective.com> - 2016-06-18 12:47 -0700
Re: Impact of implicit arrays... "Chris M. Thomasson" <invalid@invalid.invalid> - 2016-06-21 14:43 -0700
Re: Impact of implicit arrays... "Christoph M. Becker" <cmbecker69@arcor.de> - 2016-06-22 00:10 +0200
Re: Impact of implicit arrays... "Chris M. Thomasson" <invalid@invalid.invalid> - 2016-06-21 15:28 -0700
Re: Impact of implicit arrays... "Chris M. Thomasson" <invalid@invalid.invalid> - 2016-06-21 15:31 -0700
Re: Impact of implicit arrays... "Christoph M. Becker" <cmbecker69@arcor.de> - 2016-06-22 11:55 +0200
Re: Impact of implicit arrays... "Chris M. Thomasson" <invalid@invalid.invalid> - 2016-06-23 12:23 -0700
Re: Impact of implicit arrays... "Chris M. Thomasson" <invalid@invalid.invalid> - 2016-06-23 14:14 -0700
Re: Impact of implicit arrays... "Chris M. Thomasson" <invalid@invalid.invalid> - 2016-06-23 14:16 -0700
Re: Impact of implicit arrays... "Chris M. Thomasson" <invalid@invalid.invalid> - 2016-06-23 18:14 -0700
Re: Impact of implicit arrays... "Chris M. Thomasson" <invalid@invalid.invalid> - 2016-06-23 18:46 -0700
Re: Impact of implicit arrays... "Michael Haufe (TNO)" <tno@thenewobjective.com> - 2016-06-21 17:35 -0700
Re: Impact of implicit arrays... "Chris M. Thomasson" <invalid@invalid.invalid> - 2016-06-21 21:08 -0700
Re: Impact of implicit arrays... "Michael Haufe (TNO)" <tno@thenewobjective.com> - 2016-06-21 23:09 -0700
Re: Impact of implicit arrays... "Chris M. Thomasson" <invalid@invalid.invalid> - 2016-06-23 14:38 -0700
Re: Impact of implicit arrays... "Michael Haufe (TNO)" <tno@thenewobjective.com> - 2016-06-24 07:16 -0700
Re: Impact of implicit arrays... "Chris M. Thomasson" <invalid@invalid.invalid> - 2016-06-25 18:03 -0700
Re: Impact of implicit arrays... "Michael Haufe (TNO)" <tno@thenewobjective.com> - 2016-06-25 18:24 -0700
Re: Impact of implicit arrays... "Chris M. Thomasson" <invalid@invalid.invalid> - 2016-07-01 13:52 -0700
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