DATA Step, Macro, Functions and more

DATA STEP

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Super Contributor
Posts: 1,041

DATA STEP

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;

Super User
Posts: 11,343

Re: DATA STEP

Posted in reply to robertrao

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

Super User
Posts: 19,791

Re: DATA STEP

Posted in reply to robertrao
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;
Super Contributor
Posts: 1,041

Re: DATA STEP

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

Super User
Posts: 11,343

Re: DATA STEP

Posted in reply to robertrao

You could check with:

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

Super User
Posts: 19,791

Re: DATA STEP

Posted in reply to robertrao
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.
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