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AW: st: AW: Keeping trailing zeros when formatting a decimal


From   "Martin Weiss" <martin.weiss1@gmx.de>
To   <statalist@hsphsun2.harvard.edu>
Subject   AW: st: AW: Keeping trailing zeros when formatting a decimal
Date   Thu, 1 Oct 2009 14:54:18 +0200

<> 

" I want it to display say "-0.22" rather than 
"-.22", and putting a 0 after the % doesn't seem to work:"


Use "f" instead of "g":


*************
display %3.2f 0.5259
*************



HTH
Martin


-----Ursprüngliche Nachricht-----
Von: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] Im Auftrag von Miranda Kim
Gesendet: Donnerstag, 1. Oktober 2009 14:55
An: statalist@hsphsun2.harvard.edu
Betreff: Re: st: AW: Keeping trailing zeros when formatting a decimal

For the leading zero issue, I want it to display say "-0.22" rather than 
"-.22", and putting a 0 after the % doesn't seem to work:
. display %09.2g 0.5259
      .53
but I used:
subinstr(string(-0.22, "%9.2g"), ".", "0.",.)
which does the job.
However I'm still stuck for the trailing zeros...
I use "g" rather than "f" because I am wanting to apply this to many 
different scales of decimal numbers, whether it be 0.000026789 or 
0.23897, and just want to keep 2 significant figures.
My little program goes as follows:

program def numformat, rclass
    args num
    if abs(`num') > 1 {
        return local num = string(round(`num', 0.01), "%9.2f")
    }
    if abs(`num') < 1 & abs(`num') >= 0.0001 {
        return local num = subinstr(string(`num', "%9.2g"), ".", "0.",.)
    }
    if abs(`num') < 0.0001 {
        return local num = "< 0.0001"
    }
end

Martin Weiss wrote:
> <> 
>
> Most of your problems seem to be due to the fact that you are using "g"
> instead of "f" in your formatting directives. See [U], 12.5 for more info.
> Leading zeroes can be induced by inserting a zero after the percentage
sign.
>
> Also note that you do not need to use the -string()- function, as
-display-
> is able to apply a formatting directive on its own, as seen in the last
row:
>
>
> *************
> di "`=string(-0.000029, "%9.2g")'"
> di in red "`=string(-0.000029, "%09.2f")'"
>
> di "`=string(-0.0000201, "%9.2g")'"
> di in red "`=string(-0.0000201, "%7.6f")'"
>
> di "`=string(-0.000029, "%9.1g")'"
> di in red "`=string(-0.000029, "%09.1f")'"
> di in red %09.1f -0.000029
> *************
>
>
>
> HTH
> Martin
>
>
> -----Ursprüngliche Nachricht-----
> Von: owner-statalist@hsphsun2.harvard.edu
> [mailto:owner-statalist@hsphsun2.harvard.edu] Im Auftrag von Miranda Kim
> Gesendet: Donnerstag, 1. Oktober 2009 13:33
> An: statalist@hsphsun2.harvard.edu
> Betreff: st: Keeping trailing zeros when formatting a decimal
>
> I would be very grateful for advice on the following basic formatting 
> questions...
>
> To store a number as a string with a format showing 2 significant 
> figures, I do the following, for example:
> di "`=string(-0.000029, "%9.2g")'"
>
> If the second significant figure is a zero, how can I make sure this is 
> still displayed?
> The following produces:
> . di "`=string(-0.0000201, "%9.2g")'"
> -.00002
> when I want it to display "-0.000020"
>
> Also, how can I make sure it displays the zero before the decimal point?
>
> Also, why does
> . di "`=string(-0.000029, "%9.1g")'"
> -.000029
> not show only 1 significant figure?
>
> Many thanks for your help.
>
>
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