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st: AW: Keeping trailing zeros when formatting a decimal


From   "Martin Weiss" <martin.weiss1@gmx.de>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: AW: Keeping trailing zeros when formatting a decimal
Date   Thu, 1 Oct 2009 14:28:03 +0200

<> 

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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