In comp.lang.javascript message , Sat, 24 Mar 2007 09:05:21, MassiveProng posted:
Feel free to contribute here in news:comp.lang.javascript, if you ever have anything useful to say; but not otherwise.
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(c) John Stockton, Surrey, UK. ???@merlyn.demon.co.uk Turnpike v6.05 MIME.
Web - FAQish topics, acronyms, & links.
Check boilerplate spelling -- error is a public sign of incompetence.
Never fully trust an article from a poster who gives no full real name.
I don't see any code there (a few busted links). What sort of algorithm is it that you are trying to converge?
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Paul Hovnanian mailto:Paul@Hovnanian.com
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for a tutorial and the underlying 14 x 14 equation set to be deterministically solved.
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In comp.lang.javascript message , Sat, 24 Mar 2007 21:21:52, Don Lancaster posted:
It seems almost instant now.
Check that you are taking full advantage of symmetry, and not calculating anything more than once - but I expect you did that. Don't recalculate pi/180 or 180/pi - in fact, work entirely in radians and cycles, except for I/O, of which there is little.
Minimise object lookups - e.g. document.mainform.fp1e.value = p1ed ; document.mainform.fp2s.value = p2sd ; ... becomes dmf = document.mainform // done only once
For me, setting Q = Math.sin globally and using Q(0.1) instead of Math.sin(0.1) makes a small improvement.
p1e = eval (document.mainform.fp1e.value) // why eval? use p1e = +document.mainform.fp1e.value // see FAQ
Many, at least, of your eval calls are obviously not inner-loop; but I doubt whether any are needed.
I agree with what other CLJ users wrote - for a better S/N, post only there (FU set).
I did not have time to determine your iteration algorithm, and that's where the greatest gains must lie.
It appears, from that page, that it deals with something related to work I used to do - but perhaps you already know that. The page desperately needs a SMALL box near the top saying what a Magic Sinewave is (mainly for those who know the subject but not the term) with a link to .
I tried your code on my automatic re-indenter, but it seemed to be taking infinite time on that amount.
Once upon a time, I made a 16 2/3 Hz PSD (mains-locked) by switching (with reeds!) positive for one cycle of 50 Hz, off for half a cycle, negative for one cycle, off for half a cycle, repeated. Earlier, I built a three-phase oscillator with (IIRC) three OC71 transistors and 6 resistors - it generated 200 kHz trapezium waves, more or less.
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(c) John Stockton, Surrey, UK. *@merlyn.demon.co.uk / ??.Stockton@physics.org
Web - FAQish topics, acronyms, & links.
Correct
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