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Kevin,
I have the same results in SAS v6.12 for Windows. But a length of 3 bytes
here indicates a largest value of 2**(8*3)= 16777216. Are you sure your
largest value would be 8192 (2**13), based on 14 bits, how many bytes is
that in your system? Maybe SAS allows the statement LENGTH numvar 3 (for
compatibility reasons); but SAS may find it difficult to actually store a
3-byte number and thus sneaky makes it 4 (or more) bytes, allowing all
4-byte values. Try an even larger value to see where it goes "wrong".
Regards - Jim.
--
Y. (Jim) Groeneveld, MSc IMRO TRAMARKO tel. +31 412 407 070
senior statistician, P.O. Box 1 fax. +31 412 407 080
senior data manager 5350 AA BERGHEM IMRO TRAMARKO: a CRO
J.Groeneveld@ITGroups.com the Netherlands in clinical research
My computer beeps when it complains; I complain when it beeps
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> -----Original Message-----
> From: Kevin Roland Viel [SMTP:kviel@EMORY.EDU]
> Sent: Friday, March 08, 2002 3:58 PM
> To: SAS-L@LISTSERV.UGA.EDU
> Subject: Length statement and numeric precision
>
> Greetings again,
>
> In three bytes, the largest integer that can exactly be represented on
> IEEE system should be 8,191 (TS-654 states 8,192). The LENGTH statement
> is supposed to "Specifies the number of bytes for storing variables".
> Why am I able to see 10,000?
>
> 151 %put Version=&sysver OS=&SYSSCPL;
> Version=8.2 OS=WIN_NT
> 152 data _null_;
> 153 length x 3;
> 154 /* binary 01 1111 1111 1111 */
> 155 x=8191;
> 156 put x=;
> 157 /* binary 10 0000 0000 0000 */
> 158 x=8192;
> 159 put x=;
> 160 /* binary 10 0111 0001 0000 */
> 161 x=10000;
> 162 put x=;
> 163 run;
>
> x=8191
> x=8192
> x=10000
> NOTE: DATA statement used:
> real time 0.01 seconds
> cpu time 0.01 seconds
>
>
> Regards,
>
>
> Kevin
>
> Kevin Viel
> Department of Epidemiology
> Rollins School of Public Health
> Emory University
> Atlanta, Ga 30322
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