How We separate Odd and Even and Prime numbers in SAS ???

[Mohan_Reddy]

I have dataset like below...

data ds;

do i=1 to 1000;

output;

end;

stop;

run;

Now i want output like

Using that dataset "i" value create 3 new columns(variables)..One Variable should contain Odd numbers and

One variable should contain Even numbers

Last variable should contain Prime numbers

How do write a programme ???please help us....

[PeterClemmensen]

What if a number is both prime and odd?

[Mohan_Reddy]

Through that programme i values =1 2 3 4 ..........................1000 right

through that dataset i want create new dataset have three new variables

like

Odd_Number ( first variable name ) = 1 3 5 7 9 11 ................999

Even_Number (second variable name) = 2 4 6 8 10 12 ..................1000

Prime_Numbers (third variable name) = 2 3 5 7 11 13 ...........997

Like these i want output...I Hope you understand my doubt what i need in output dataset..

Please find a solution for that !!!!

[PeterClemmensen · Accepted solution]

data want(drop=j);
   array p {1000} _temporary_ (0 2:1000);

   do i = 2 to 1000;              
      do j = i to 1000/i;              
         p [i*j] = 0;
      end;
   end;

   do until (lr);
      set ds end=lr;
      call missing (Even, Odd, Prime);
      if mod(i, 2) = 0 then Even = i;
      else                  Odd = i;
      if whichn(i, of p[*]) then prime = i;
      output;
   end;
run;

[Kurt_Bremser]

Instead of creating redundant values, create flags:

%let max = 1000;

data have;
do i = 1 to &max.;
  output;
end;
run;

data want;
set have;
length primes $&max.;
retain primes;
if mod(i,2) = 0
then do;
  odd = 'N';
  even = 'Y';
end;
else do;
  odd = 'Y';
  even = 'N';
end;
if substr(primes,i,1) = ' '
then prime = 'Y';
else prime = 'N';
index = i;
if i > 1 then do while (index <= &max.);
  substr(primes,index,1) = 'Y';
  index + i;
end;
drop primes index;
run;