求助 为什么pdv只输出2个变量

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很奇怪为什么a中只有2个变量，date和n而没有name。按道理length声明之后，pdv里就会有name了啊，最后也一样输出啊。为什么结果只有2个呢？难道filevar变量不输出？求解释。
代码：
data a;
length name $ 100;
input name $ ;
file files filevar=name ;
date=date();
format date yymmdd10.;
n=name;
put 'wo' date;
cards;
pls
pls_1
pls_2
;
run;

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关键词：PDV length format cards FORMA 求助 变量 输出 PDV

SAS  帮助： FILEVAR=variable defines a variable whose change in value causes the FILE statement to close the current output file and open a new one the next time the FILE statement executes. The next PUT statement that executes writes to the new file that is specified as the value of the FILEVAR= variable.

Restriction:	The value of a FILEVAR= variable is expressed as a character string that contains a physical filename.[/td]
Interaction:	When you use the FILEVAR= option, the file-specification is just a placeholder, not an actual filename or a fileref that has been previously-assigned to a file. SAS uses this placeholder for reporting processing information to the SAS log. It must conform to the same rules as a fileref.[/td]
Tip:	This variable, like automatic variables, is not written to the data set.

2# pobel
thx 以后有问题先问问help。