Good day. I have created a lag of all my variables and would like to drop the original variables and only keep the lagged variables.
The following code was used unsuccessfully:
data want;
set have;
array vars{*} _numeric_;
array L1vars{1000};
do i = 1 to dim(vars);
L1vars{i} = lag(vars{i});
end;
drop i;
drop vars;
run;
You can't drop arrays like that. Arrays are only temporary references for groups of variables, not elements themselves. You can of course pre-build the vars:
proc sql; select distinct NAME into :V separated by " " from SASHELP.VCOLUMN where LIBNAME="WORK" and MEMNAME="HAVE" and TYPE="num"; quit;
data want;
set have;
array vars{*} &V.;
array L1vars{1000};
do i = 1 to dim(vars);
L1vars{i} = lag(vars{i});
end;
drop i &V.;
run;
Since your matrix refer to alll numeric variables. Try drop _numeric_;
@Ksharp gets partial credit here. It's the right statement to add, but has to be added in exactly the right place.
In a DATA step, _numeric_ refers to all numeric variables that have been defined so far. To get rid of the original numeric variables, the order of the statements must specifically be:
array vars {*} _numeric_;
drop _numeric_;
array L1vars .........
That's the only point in your DATA step where _numeric_ refers to all the original numeric variables coming from HAVE. (Yes, technically the DROP statement could come between the SET statement and the first ARRAY statement.)
Join us for SAS Innovate April 16-19 at the Aria in Las Vegas. Bring the team and save big with our group pricing for a limited time only.
Pre-conference courses and tutorials are filling up fast and are always a sellout. Register today to reserve your seat.
Need to connect to databases in SAS Viya? SAS’ David Ghan shows you two methods – via SAS/ACCESS LIBNAME and SAS Data Connector SASLIBS – in this video.
Find more tutorials on the SAS Users YouTube channel.