array

定义数组：ARRAY ARRAY_NAME(SUBSCRIPT) ($) VARIABLE-LIST ARRAY-VALUES

访问数组：PROC PRINT DATA = ARRAY_NAME;

OF运算符：

SUM = SUM(OF A(*));

MIN = MIN(OF A(*));

MEAN = MEAN(OF A(*));

IN运算符访问特定值：

IF 'XXX' IN COLOURS THEN available = 'Yes';ELSE available = 'No';

批量处理缺失值或特定值：

对数据集TMP的数值性字段为缺失值和<-999的批量赋值为-9999999；对字符字段缺失值统一赋值“-9999999”

DATA TMP1;
SET TMP;
ARRAY NUM_V _NUMERIC_;
DO OVER NUM_V;
IF MISSING(NUM_V) OR NUM_V<-999 THEN NUM_V=-9999999;
END;

ARRAY CHAR _CHAR_;
DO OVER CHAR;
IF MISSING(CHAR) THEN CHAR="-9999999";
END;
RUN;

DO TO语句批量赋值：

批量更改数据类型（把tmp中字符型字段批量变成数值型）
data _NULL_;
set tmp;
array tmp[*] _character_;
call symputx("nvar",dim(tmp));
run;

data tmp1;
set tmp end=eof;
array tmp[*] _character_;
length vars $32767.;
retain vars "";
array num[&nvar.];
do i=1 to dim(tmp);
num[i] = input (tmp[i],best12.);
if eof then vars=catx(" ",vars,cats(vname(num[i]),"=",vname(tmp[i])));
end;
if eof then call symputx("vars",vars);
drop _character_ i;
run;

%put &vars.;

data last;
set tmp1;
rename &vars.;
run;

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