Date:         Sun, 30 Aug 2009 21:31:24 -0500
Reply-To:     OR Stats <stats112@GMAIL.COM>
Sender:       "SAS(r) Discussion" <SAS-L@LISTSERV.UGA.EDU>
From:         OR Stats <stats112@GMAIL.COM>
Subject:      Re: Error in intrepretting sqrt's & exp's
Comments: To: Jack Hamilton <jfh@stanfordalumni.org>
In-Reply-To:  <EDFF7826-560E-4CB3-A3BD-135CC6BC337C@alumni.stanford.org>
Content-Type: text/plain; charset=ISO-8859-1

terrific!  thx much

On Sun, Aug 30, 2009 at 9:23 PM, Jack Hamilton <jfh@alumni.stanford.org>wrote:

> SYSEVALF takes an expression as its first argument, but not an expression
> that contains functions.  I don't quickly see that made explicit in the
> documentation, but it's probably in there somewhere.  In this context,
> expressions consist of numbers and operators.
>
> You can use the %SYSFUNC macro function inside the %SYSEVALF function to do
> what you want:
>
> =====
> 1    %let b=%SYSEVALF(%sysfunc(SQRT(2*%sysfunc(EXP(-.5))-1)));
> 2    %put &B.;
> 0.46158565773349
> =====
>
> --
> Jack Hamilton
> jfh@alumni.stanford.org
> Tots units fem força!
>
>
>
>
>
> On Aug 30, 2009, at 7:10 pm, OR Stats wrote:
>
> Hello:
>>
>> I am getting an error when I try to evaluate the following function in SAS
>> and setting it as a macro variable:
>>
>>
>> %let b=%SYSEVALF(SQRT(2*EXP(-.5)-1));
>>
>> A character operand was found in the %EVAL function or %IF condition where
>> a
>> numeric operand is required. The condition
>>
>> was: SQRT(2*EXP(-.5)-1)
>>
>
>