宏变量的问题 - 经管之家

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收藏 2010-09-15

data _null_;
do i=1 to 10;
call symput("num||i",i);
end;
run;
我想把1-10的值赋值给NUM1到NUM10。请问上述代码错误的原因是什么，怎么解决呢？

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2010-9-15 11:49:18

data _null_;
do i=1 to 10;
call symput("num"||strip(i),i);
end;
run;

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2010-9-17 09:23:47

pobel 发表于 2010-9-15 11:49
data _null_;
do i=1 to 10;
call symput("num"||strip(i),i);
end;
run;

It is a good practice to use call symputx rather ther call symput.

Here is the reasons.

CALL SYMPUTX is similar to CALL SYMPUT except that

CALL SYMPUTX does not write a note to the SAS log when the second argument is numeric. CALL SYMPUT, however, writes a note to the log stating that numeric values were converted to character values.
CALL SYMPUTX uses a field width of up to 32 characters when it converts a numeric second argument to a character value. CALL SYMPUT uses a field width of up to 12 characters.
CALL SYMPUTX left-justifies both arguments and trims trailing blanks. CALL SYMPUT does not left-justify the arguments, and trims trailing blanks from the first argument only. Leading blanks in the value of name cause an error.
CALL SYMPUTX enables you to specify the symbol table in which to store the macro variable, whereas CALL SYMPUT does not.

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