Statalist


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

st: RE: Problem with replace if - test condition works only for some values of test variable


From   "Martin Weiss" <martin.weiss1@gmx.de>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: Problem with replace if - test condition works only for some values of test variable
Date   Fri, 24 Oct 2008 09:15:10 +0200

"Start with any dataset open": Not quite true. You must -set obs 101- to run
your code...

Also look at http://www.stata.com/support/faqs/data/float.html



HTH
Martin

-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Naunihal Singh
Sent: Friday, October 24, 2008 12:32 AM
To: statalist@hsphsun2.harvard.edu
Subject: st: Problem with replace if - test condition works only for some
values of test variable

Please, indulge me. I'm sure I've overlooked something basic, but
replace if is working only for certain values of the test variable and
not for others.

Start with any dataset open
Here is the code fragment that replicates my problem:

ge y=.
generate x= (_n/100)-0.01 in 1/101
replace y=1 if x==0
replace y=1 if x==.01
replace y=1 if x==.25
replace y=1 if x==.26
replace y=1 if x==.5
replace y=1 if x==.51
replace y=1 if x==.75
replace y=1 if x==.76
replace y=1 if x==1
replace y=1 if x==.99

I'm able to make assignments to y only when x equals 0, .25, .5, .75,
and 1 but for no other value. This is the output I get:

. replace y=1 if x==.5
(1 real change made)

. replace y=1 if x==.51
(0 real changes made)

Why does this happen and how do I fix it? x is a float, so it should
have enough precision for the test condition. And if the test can
recognize .25 it should be able to recognize .26.

Thanks

N
*
*   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