Talk:Thiele's interpolation formula: Difference between revisions

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== How many entries should the trig table have? ==
How many entries should the trig table have? --[[User:Short Circuit|Michael Mol]] 14:46, 2 October 2010 (UTC)
: I make it 16, with ''x'' varying by steps of 0.05 from 0 to 1.55. (Now, if only I could make my version of this ''work'', but that algol68 code is deeply gnarly; does it really have different base indices in different dimensions?!?) –[[User:Dkf|Donal Fellows]] 16:01, 2 October 2010 (UTC)
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: Understood, but since the task is about interpolation, I figured that generating the initial reference table might be a spurious requirement. --[[User:Short Circuit|Michael Mol]] 23:43, 2 October 2010 (UTC)
I confess that I was trying to think of something "interesting" (yet simple) to interpolate, and recalled using interpolation to calculate inverse trig functions from high school log/trig tables[http://www.eton.co.nz/shop/Mathematics+Text+And+Homework+Books/Age+17+Alternative+Textbooks/Eton+Statistical+And+Math+Tables+%28Fourth+Edition%29.html]. Hence this unit test. What would be nice would be some "historic" interpolation, e.g. [[wp:Discovery of Neptune#Discovery Observation: September 24th 1846|Discovery of Neptune]], that would be another task in itself. The three π calculations from a generic trig table is practical. [[User:NevilleDNZ|NevilleDNZ]] 00:18, 3 October 2010 (UTC)
 
=== re:base indices in different dimensions ===
 
Yes. Here is a quote from the 1968 Congress: [http://www.cs.ru.nl/~kees/home/papers/psi96.pdf C.H.A. Koster (1993). "The Making of Algol 68" (PDF)].
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:Does that explain why the cos result is way off? --[[User:Ledrug|Ledrug]] 23:12, 27 July 2011 (UTC)
 
===Some formulae now invisible on standard OS X browsers===
May need tidying up to achieve formula visibility on the OS X platform. Problems introduced at 18:05, 31 July 2016, which made several formula elements invisible on the majority of browsers (those which display the server side graphic for formulae, rather than locally processing MathML where requisite fonts are available) may include recent introduction of redundant white space flanking of LateX expressions inside <math> tags [[User:Hout|Hout]] ([[User talk:Hout|talk]]) 13:33, 16 September 2016 (UTC)
 
: Now repaired [[User:Hout|Hout]] ([[User talk:Hout|talk]]) 19:22, 28 September 2016 (UTC)