默认去双尾空白,其他效果和symput一样 随后一个参数表示宏储存的位置'L'=local 'G'=global TheSYMPUTroutine and theSYMPUTXroutinecan only create a local macrovariable if alocal symbol table already exists.If nolocal symbol table exists when
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Automatic Macro Variables都是全局宏,在macro外定义的也是global micro variable,在macro内定义的是本地宏变量的。(宏变量的作用域不涉及文件(%include问题),数据集或者proc步。因为不是一个层级的东西。) 使用%global var和%local var 定义的变量不能直接赋值,要使用后面的三种方法赋值。 4.宏变量储存在哪? The...
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*/ by keysequence; run; ** create **SORTSTRING macro variable; %global &dataset.SORTSTRING; data null_; set _temp end=eof; length domainkeys $ 200; retain domainkeys ''; domainkeys = trim(domainkeys) || ' ' || trim(put(variable,8.)); if eof then call symputx(compress("&dataset"...
Suppose you have a program that yourun once a month.Every time you have to edit the program so it will select data for the correct month and print the correct title. This is time-consuming and prone to errors.You canuse %LET to create a macro variable.Then you can change the value ...
%create_local2 %put after macro: var1=&var1; %put after macro: var2=&var2; /*全局宏变量*/ *1. Use %LET Statement.; %let gl_var1=global macro variable1; *2. Use CALL SYMPUT in DATA Step.; data_null_; call symput('gl_var2', 'global ...
(codevar=);/* create macro variable if needed */ %global special; data _null_; set names; if &codevar=99 and dept=’BB’then call symput(’special’,item); run; %mend items; data sales;/* attempt to reference macro variable fails */ set prices; length saleitem $ 20; 500 then ...