Transposing wide to long in SAS, without extra columns

Question

I\'d like to transpose a dataset, but SAS insists on adding a new column, if the \"by\" column has multiple entries.

So if I run

data test;
    input a b         


        

Answer 1

data output;
set test;
array vars {*} b -- c; * define array composed of list of variables from B to C, have to be of same type;

length varname $32;
keep a varname value;

do i=1 to dim(vars);* loop array (list of variables);
    varname= vname(vars(i));* get name of variable that provided value;
    value = vars(i);* get the value of variable;
    output; *output row;
end;
run;