topic Re: DATA STEP in SAS Programming

DATA STEP

robertrao — Mon, 14 Dec 2015 17:55:50 GMT

IS THE "COMMENTED" AND THE "NON SCOMMENTED" LINES DOING THE SAME THING IN THE BELOW CODE????

THANKS

data want;

set ints_exts2;

array ins int:;

array outs ext:;

do i = 1 to dim(ins);

if ins(i)^=. and outs(i)^=. then duration=sum(duration,outs(i)-ins(i)) /*UNCOMMENTED*/

*if 2=N(ins(i),outs(i)) then duration=sum(duration,outs(i)-ins(i)); /*COMMENTED*/

end

;

days = datepart(duration);

time = timepart(duration);

hrs=time/(60*60);

Total_vent_hours =days*24+ time/(60*60);

vent_days=Total_vent_hours/24;

run;

Re: DATA STEP

ballardw — Mon, 14 Dec 2015 18:13:13 GMT

Not exactly as the Not missing, ^=., works for character variables while N(variables) requires all of the arguments to be numeric.

If you are dealing with mixed data types you might want CMISS(ins[i], out[i]) = 0

Re: DATA STEP

Reeza — Mon, 14 Dec 2015 18:21:28 GMT

If you have any other special missing values that also won't give you the same results.

data have;
a=.; b=2; output;
a=1; b=.N; output;
a=2; b=3; output;
a=.; b=.; output;
a=.A; b=.A; output;
run;

data want;
set have;
if a ne . and b ne . then flag=1;
else flag=0;
x=n(a,b);
run;

Re: DATA STEP

robertrao — Mon, 14 Dec 2015 18:29:30 GMT

Thanks Reeza.

INS and OUTS arrays contain dates only. Can have missing values.

Wanted toi know if in that case both line output the same results??

Thanks

Re: DATA STEP

ballardw — Mon, 14 Dec 2015 19:35:52 GMT

You could check with:

compare =(ins(i)^=. and outs(i)^=.) = (N(ins(i),outs(i)));

Re: DATA STEP

Reeza — Mon, 14 Dec 2015 20:26:09 GMT

If you have a very specific scenario, it's faster to test it than ask. In general, no it won't, for your case it may, as long as you can guarantee that it will always stay that way.