Talk:Roots of a quadratic function: Difference between revisions

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== obscure algorithm ? ==

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I don't like being pushed to use obscure (but more stable) ~~algorhithm~~ over algorithm everyone instantly recognises.

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I don't like being pushed to use obscure (but more stable) algorithm over algorithm everyone instantly recognises.

Said that, I could live with it. But I want to point that:

- link for "What Every Scientist Should Know About Floating-Point Arithmetic" is dead;

* - link for "What Every Scientist Should Know About Floating-Point Arithmetic" is dead;

- one can google for it, but formatting is different, so how to find what "page 9" actually is?

* - one can google for it, but formatting is different, so how to find what "page 9" actually is?

- quoted in the text, "Suggested by Middlebrook (D-OA), a better numerical method: to define two parameters q=sqr(ac)/b (...)" naturally fails over if a>0 and c<0.

* - quoted in the text, "Suggested by Middlebrook (D-OA), a better numerical method: to define two parameters q=sqr(ac)/b (...)" naturally fails over if a>0 and c<0.

"do it better" ?

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Basically all the test cases had a = 1, :-) So I added some test cases especially where a ≠ 1, hence 2*a ≠ 2/a.... [[User:NevilleDNZ|NevilleDNZ]] 14:28, 16 September 2010 (UTC)

In the example above (2nd line) (-10<sup>6</sup>) isn't the same as -1e6. The former is -1,000,000 and the latter is +1,000,000. --[[User:Gerard Schildberger|Gerard Schildberger]] 18:11, 25 June 2011 (UTC)

: In the example above (2nd line) (-10<sup>6</sup>) isn't the same as -1e6. The former is -1,000,000 and the latter is +1,000,000. --[[User:Gerard Schildberger|Gerard Schildberger]] 18:11, 25 June 2011 (UTC)

:Nope. -1e6 = -1000000. And -10^6=-1000000 as well, except in some insane languages. [[User:Eoraptor|Eoraptor]] ([[User talk:Eoraptor|talk]]) 17:35, 13 August 2020 (UTC)

:: Nope. -1e6 = -1000000. And -10^6=-1000000 as well, except in some insane languages. [[User:Eoraptor|Eoraptor]] ([[User talk:Eoraptor|talk]]) 17:35, 13 August 2020 (UTC)

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Other way round surely: <math>-10^n</math> will always be positive when n is even. --Laurie Alvey 10:45, 19 May 2015 (UTC)

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::: Other way round surely: <math>-10^n</math> will always be positive when n is even. --Laurie Alvey 10:45, 19 May 2015 (UTC)

== J example ==

Dumontier, hope you don't mind me replacing your example code. I understood that you were trying to illustrate the generality of <code>p.</code> however your example used a quadratic, that had already been shown above. If you were trying to illustrate some other point I apologise! --[[User:Tikkanz|Tikkanz]] 23:14, 14 October 2009 (UTC)

== C examples ==

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Eh never mind that, and sorry about making a mess on the incorrect tags--I need sleep... --[[User:Ledrug|Ledrug]] 09:40, 25 June 2011 (UTC)

== Clojure example ==