Pictures are not data and your example input is likely incomplete in some form or another.
If you have any other numeric variable in the data set then the array _numeric_ will not give you the result you want. Please see this example:
data have;
input m1 m2 m3 other;
datalines;
100 200 300 1
100 200 . 2
100 . . 3
run;
data want(drop=i);
set have;
array m(*) _numeric_;
do i=1 to dim(m);
if m(i)>. then Apr=0.2*m(i);
end;
run;
If you have any other numeric variables in the data set then the array has to either explicitly name the variable or have a naming convention that will allow a handy list short cut.
See:
data want(drop=i);
set have;
array m(*) m1 m2 m3;
do i=1 to dim(m);
if m(i)>. then Apr=0.2*m(i);
end;
run;
/* which could be because the variable names are "nice"*/
data want(drop=i);
set have;
array m(*) m:; /* or m1-m3*/
do i=1 to dim(m);
if m(i)>. then Apr=0.2*m(i);
end;
run;
However there will be problems with this process as it appears that you add a column each month and the code for 1) the array variable list would change and 2) the name of the result variable (Apr) would change. Solutions dealing with that can range from ugly to very fragile depending on the whole process involved.
For extra added fun figure out what happened with the value of Apr from this code:
data have;
input m1 m2 m3 ;
datalines;
100 200 300 1
100 200 . 2
100 . . 3
run;
data want(drop=i);
set have;
label apr='Discount month';
array m(*) _numeric_;
do i=1 to dim(m);
if m(i)>. then Apr=0.2*m(i);
end;
run;
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