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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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关键词：symput null call Data NUM null

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

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.