data data. exprat3;
array abc _exprat_;
do over abc;
if abc=0 then abc=.;
end;
run;
现在我用的是这个CODE,data.exprat3 is the data set to manipulate, I set abc as the array name, and the _exprat_ is the name of the column which includes 0 value that needs to be turned into a missing value. 我操作之前,data is like this: