Statalist


[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

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


From   Miranda Kim <mk@mrc.soton.ac.uk>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: AW: Keeping trailing zeros when formatting a decimal
Date   Thu, 01 Oct 2009 13:54:51 +0100

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.


*
*   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/


*
*   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/



*
*   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/



© Copyright 1996–2014 StataCorp LP   |   Terms of use   |   Privacy   |   Contact us   |   What's new   |   Site index