Tuesday, May 29, 2012

SAS Is Wrong! R and Oracle Are Right. MOD(11169568236203649, 30269)=11732



For function MOD(11169568236203649, 30269), SAS returns 11731 while both Oracle  and R  return 11732. I used the following two approaches to verify SAS Is Wrong.  Oracle and R are right.
Approach 1. The following two Oracle Queries show that 11732 is the remainder
SQL>  select ( 11169568236203649 -11732)/30269 vl from dual;
        369010150193.000000
SQL>  select ( 11169568236203649 -11731)/30269 vl from dual;
        369010150193.000033


Approach 2. The following PL/SQL scripts.
At first, I wanted to run the following PL/SQL Script 1. It took too long and I had to kill the process. Instead, I ran Script 2 shown below and it returned  11732 at the end of the loop.
PL/SQL Script 1.
set serveroutput on;
declare
remainder number;
begin
remainder:=11169568236203649;
while (remainder >30269)
loop
remainder:=remainder-30269;
end loop;
dbms_output.put_line(remainder);
end;
/
PL/SQL Script 2.
set serveroutput on;
declare
remainder number;
begin
remainder:=11169568236203649;
while (remainder>302690000000)
loop
remainder:=remainder-302690000000; /* equivalent of 10,000,000 loops of -30269 */
end loop;
dbms_output.put_line(remainder);
while (remainder>30269)
loop
remainder:=remainder-30269;
end loop;
dbms_output.put_line(remainder);
end;
/
At the end of the loop, it returns 11732.

1 comment:

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