Date:         Tue, 15 Sep 2009 12:41:15 -0700
Reply-To:     "Terjeson, Mark" <Mterjeson@RUSSELL.COM>
Sender:       "SAS(r) Discussion" <SAS-L@LISTSERV.UGA.EDU>
From:         "Terjeson, Mark" <Mterjeson@RUSSELL.COM>
Subject:      Re: Precision problem
Comments: To: "dc353@hotmail.com" <dc353@HOTMAIL.COM>
In-Reply-To:  A<8cb8f5e5-9205-4682-8663-d1904c181788@j9g2000vbp.googlegroups.com>
Content-Type: text/plain; charset="us-ascii"

Hi,

You could also use the PUTN function.
It seems to do well to cosmetically
handle precision errors as long as the
number of digits in the mantissa is
not over 8.  e.g.  10.8  25.8  4. etc.


%let sum2=1.0001;

%let obs_cnt=%sysevalf((&sum2-1)*100000);
%put obs_cnt is >&obs_cnt<;

%let obs_cnt=%sysfunc(putn(%sysevalf((&sum2-1)*100000),4.2));
%put obs_cnt is >&obs_cnt<;

%let obs_cnt=%sysfunc(putn(%sysevalf((&sum2-1)*100000),25.8));
%put obs_cnt is >&obs_cnt<;

%let obs_cnt=%sysfunc(putn(%sysevalf((&sum2-1)*100000),4.));
%put obs_cnt is >&obs_cnt<;




Hope this is helpful.


Mark Terjeson
Investment Business Intelligence
Investment Management & Research
Russell Investments
253-439-2367


Russell
Global Leaders in Multi-Manager Investing







-----Original Message-----
From: SAS(r) Discussion [mailto:SAS-L@LISTSERV.UGA.EDU] On Behalf Of
dc353@hotmail.com
Sent: Tuesday, September 15, 2009 12:03 PM
To: SAS-L@LISTSERV.UGA.EDU
Subject: Precision problem

I'm submitting the following line:

%let obs_cnt = %sysevalf((&sum2-1)*100000) ;

where &sum2 = 1.0001

I get back &obs_cnt = 9.999999999

i tried to use the int function %let obs_cnt = %sysevalf(int(.5+
(&sum2-1)*100000)) ;
but that won't run.  is there an easy way to get this to work out to
10?