@Cruise wrote:
Question2:
Array code gave error:
ERROR: Array subscript out of range at line 223 column 4.
What am I doing wrong here?
data have;
input id bf1 bf2 bf3 bf4 bf5 bf6 bf7 bf8 bf9 bf10 bf11 bf12 ever;
datalines;
1 1 1 1 1 1 1 1 1 1 1 1 1 1
2 1 1 1 1 0 0 0 0 0 0 0 0 1
3 1 1 0 0 0 0 0 0 0 0 0 0 1
4 1 0 0 0 0 0 0 0 0 0 0 0 1
5 0 0 0 0 0 0 0 0 0 0 0 0 0
6 1 1 1 1 1 1 1 0 0 0 0 0 1
;
data test; set have;
array x (12) BF_1-BF_12;
do i=1 to 12;
if x(1-12)=1 then bfcat=121; else bfcat=120;
if x(1-6)=1 then bfcat=61; else bfcat=60;
if x(1-3)=1 then bfcat=31; else bfcat=30;
if x(1)=1 then bfcat=11; else bfcat=10;
end;
if bf_ever=1 then bfcat=1; else bfcat=0;
run;
The array subscript out of bound comes from each of the statements like this:
if x(1-12)=1 then bfcat=121;
The values inside the parentheses are used in a calculation to find the subscript of the array. Since 1-12 = -11 that is invalid for an array the way you defined x. Similarly 1-6 and 1-3 generate negative values and invalid subscripts of -5 and -2.
The calculation in the array subscript is common as often we do an offset such as x(i+1) to reference an element of the array but would need to make sure that the calculation resolves to something inside the defined subscripts for an array.
Here is a brief example of an array that allows negative subscripts:
data example;
array x (-10:-5) ;
do i= -10 to -5;
x(i)= i;
end;
drop i;
run;
Notice the names of the variables created by the array. Arrays defined with a lower: upper bound are useful for things that have known integer behavior but don't conveniently start at 1 such as year values.
