Combining different variables into one new variable SAS - sas

Question

I would like to combine different observations from different variables in one variable. The observations are all related to each other and are repeated measurements.
Example:
Current database layout.
**Var1 Dat1 Var2 Dat2 Var3 Dat3**
Obs1a Dat1a Dat2a Dat2a Obs3a Dat3a
Obs1b Dat1b Dat2b Dat2b Obs3b Dat3b
Obs1c Dat1c Dat2c Dat2c Obs3c Dat3c
Obs1d Dat1d Dat2d Dat2d Obs3d Dat3d
I want to create a new variable with combined observations:
Var Dat
Obs 1a Dat 1a
Obs 1b Dat 1b
.... ...
Obs 2a Dat 2a
Obs 2b Dat 2b
.... ...
Obs 3c Dat 3c
Obs 3d Dat 3d
Could somebody explain me how to do this in SAS?

Answer 1

Create 2 arrays of the "var" and "dat" values. Loop through them and use the OUTPUT statement to create 1 observation for each value in the arrays.
data test;
input var1 $ dat1 $ var2 $ dat2 $ var3 $ dat3 $;
datalines;
Obs1a Dat1a Dat2a Dat2a Obs3a Dat3a
Obs1b Dat1b Dat2b Dat2b Obs3b Dat3b
Obs1c Dat1c Dat2c Dat2c Obs3c Dat3c
Obs1d Dat1d Dat2d Dat2d Obs3d Dat3d
;
run;
data test2(keep=var dat);
set test;
array v[3] var1-var3 ;
array d[3] dat1-dat3;
format var dat $8.;
do i=1 to 3;
var = v[i];
dat = d[i];
output;
end;
run;