Trig functions Kokopeelle 30.09.2006 03:41:01 I have been studing the early formation fo trig tables by Ptolemy abotu 100-200Ad. I now would like to know the methodolgy tht ecel uses for calculating these functions. I'm not interested in the detailed code, just the general methods. Can anyone help? -- rk koko pele

RE: Trig functions paul 30.09.2006 06:58:01 the excel functions for trig are COS ACOS ACOSH COSH SIN ASIN SINH ASINH TAN ATAN TANH ATANH RADIANS DEGREES excel works in radians by default so the radians and degree function are there to swap back and forth -- paul paul.shepherd[ at ]nospamparadise.net.nz remove nospam for email addy! "Kokopeelle" wrote: [Quoted Text] > I have been studing the early formation fo trig tables by Ptolemy abotu > 100-200Ad. I now would like to know the methodolgy tht ecel uses for > calculating these functions. I'm not interested in the detailed code, just > the general methods. > > Can anyone help? > -- > rk koko pele

Re: Trig functions "Bernard Liengme" <bliengme[ at ]stfx.TRUENORTH.ca> 30.09.2006 18:11:40 My bet is that Excel uses a series expansion sin(x) = x -x^3/3! + x^5/5! - x^7/7! ... Google on binomial, Taylor and Maclaurin series to learn more (or read a math textbook) best wishes -- Bernard V Liengme www.stfx.ca/people/bliengme remove caps from email "Kokopeelle" <Kokopeelle[ at ]discussions.microsoft.com> wrote in message news:AB9D0C9D-AAA9-4789-A588-AB6B7342DBD5[ at ]microsoft.com... [Quoted Text] >I have been studing the early formation fo trig tables by Ptolemy abotu > 100-200Ad. I now would like to know the methodolgy tht ecel uses for > calculating these functions. I'm not interested in the detailed code, > just > the general methods. > > Can anyone help? > -- > rk koko pele

Re: Trig functions "Dana DeLouis" <ddelouis[ at ]bellsouth.net> 30.09.2006 19:58:51 My guess would be some version of the "CORDIC algorithm." One of many search hits: http://www.dspguru.com/info/faqs/cordic2.htm (See 2.1) http://www.andraka.com/cordic.htm etc.. -- Dana DeLouis Windows XP & Office 2003 "Bernard Liengme" <bliengme[ at ]stfx.TRUENORTH.ca> wrote in message news:%23lV4hvL5GHA.940[ at ]TK2MSFTNGP03.phx.gbl... [Quoted Text] > My bet is that Excel uses a series expansion > sin(x) = x -x^3/3! + x^5/5! - x^7/7! ... > > Google on binomial, Taylor and Maclaurin series to learn more (or read a > math textbook) > best wishes > > -- > Bernard V Liengme > www.stfx.ca/people/bliengme > remove caps from email > > "Kokopeelle" <Kokopeelle[ at ]discussions.microsoft.com> wrote in message > news:AB9D0C9D-AAA9-4789-A588-AB6B7342DBD5[ at ]microsoft.com... >>I have been studing the early formation fo trig tables by Ptolemy abotu >> 100-200Ad. I now would like to know the methodolgy tht ecel uses for >> calculating these functions. I'm not interested in the detailed code, >> just >> the general methods. >> >> Can anyone help? >> -- >> rk koko pele > >