SAS Enterprise Guide 7.1
I'm trying to write codes to complete the following task:
Here are two datasets
Dataset A Dataset B
Var1 Var2 Var3 Var4
x1.1 x1.2 y1.1 y1.2
x2.1 x2.2 y2.1 y2.2
And the generated dataset/table should be
Dataset C
VarY
z1
z2
z3
z4
whereas z1 = FUNCTION(x1.1,x1.2,y1.1,y1.2)
z2 = FUNCTION(x1.1,x1.2,y2.1,y2.2)
z3 = FUNCTION(x2.1,x2.2,y1.1,y1.2)
z4 = FUNCTION(x2.1,x2.2,y2.1,y2.2)
Var1, Var2, Var3, Var4, VarY are column/variable names.
FUNCTION in this case could be
GEODIST(latitude-1, longitude-1, latitude-2, longitude-2, );
Not sure how to do it, probably Do/Loop is needed?
No loop, this is called a CROSS JOIN or cartesian product where all rows are matched with all other rows.
With regard to combing the datasets then a simple sql code should be good to create a cartesian product. However i am not sure how we could use the function. a catx function could be used to concatenate the var1-var4.
data A;
input Var1$ Var2$;
cards;
x1.1 x1.2
x2.1 x2.2
;
data b;
input Var3$ Var4$;
cards;
y1.1 y1.2
y2.1 y2.2
;
proc sql;
create table test as select a.*, b.* from a as a , b as b;
quit;
No loop, this is called a CROSS JOIN or cartesian product where all rows are matched with all other rows.
Here's one approach to assemble all the needed information:
data want;
set a;
set b;
prior_var1 = lag(var1);
prior_var2 = lag(var2);
prior_var3 = lag(var3);
prior_var4 = lag(var4);
if _n_ > 1 then do;
VarY = geodist(prior_var1, prior_var2, prior_var3, prior_var4);
output;
VarY = geodist(prior_var1, prior_var2, var3, var4);
output;
VarY = geodist(var1. var2. prior_var3, prior_var4);
output;
VarY = geodist(var1, var2, var3, var4);
output;
end;
keep VarY;
run;
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