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From |
Roy Wada <roywada@hotmail.com> |

To |
<statalist@hsphsun2.harvard.edu> |

Subject |
RE: st: RE: Keeping trailing zeros when formatting a decimal |

Date |
Thu, 1 Oct 2009 13:05:59 -0700 |

<031173627889364697C50B3B266CBB8A051E78EC@GEOGMAIL.geog.ad.dur.ac.uk> Content-Type: text/plain; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 =20 log10 wasn't available back then. I am not sure floor( ) was available=2C e= ither. =20 At least that's my excuse. In a way my codes are utterly basic=2C doing it from scratch from the princ= iples=20 of high school mathematics. =20 No doubt the codes can be shortened. There is something about the negative number rounding in the wrong directio= n=20 but I don't recall offhand. Incidently=2C this is an example that doesn't work without a further adjust= ment. =20 . di round(10 * 10^mod(log10(0.0001)=2C 5)) 100 =20 Roy =20 =20 > This generated a lively thread. (Oddly enough=2C although I still remembe= r > teachers stressing the idea of sig.fig. -- as it was called where I grew > up -- in practice I always want to program display with either Stata's > defaults or a fixed number of decimal places.)=20 >=20 > My one contribution is slightly oblique. If existing formats don't suit= =2C > it seems a better strategy to drill down and try first principles.=20 >=20 > 1. Significant figures can be got from the fractional part of the base > 10 logarithm of whatever it is.=20 >=20 > . di round(10 * 10^mod(log10(.123456789)=2C 1)) > 12 >=20 > . di round(10 * 10^mod(log10(123456789)=2C 1)) > 12 >=20 > -- with different prefactors as desired.=20 >=20 > 2. Multiplying powers can be got from the integer part of same.=20 >=20 > . di floor(log10(123456789)) > 8 >=20 > . di floor(log10(.123456789)) > -1 >=20 > 3. Logically it seems that's all the information you need to work out > leading and trailing zeros=2C except that if there's a negative sign you > have to strip it off first and put it back again.=20 >=20 > I haven't tried to understand Roy Wada's program=2C which at heart should > be equivalent to this. No doubt the help file will document that it also > deals with complications that I have missed.=20 >=20 > Nick=20 > n.j.cox@durham.ac.uk =0A= _________________________________________________________________=0A= Microsoft brings you a new way to search the web. Try Bing=99 now=0A= http://www.bing.com?form=3DMFEHPG&publ=3DWLHMTAG&crea=3DTEXT_MFEHPG_Core_ta= gline_try bing_1x1= * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

**References**:**st: Keeping trailing zeros when formatting a decimal***From:*Miranda Kim <mk@mrc.soton.ac.uk>

**st: RE: Keeping trailing zeros when formatting a decimal***From:*"Nick Cox" <n.j.cox@durham.ac.uk>

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