随后，尝试输出已删除的Macro Variable，如%put &m_age1，将不会显示任何内容，因为该变量已被删除。另外，若尝试删除一个不存在的Macro Variable，系统会在日志中给出相应提示。在%symdel语句中加入/nowarn选项，可以忽略该操作引发的警告信息，从而在日志中不进行相应提示：```sas %symdel macro_
2. When you reference a macro variable in a SAS program, SASreplaces the reference with the text valuethat has been assigned to that macro variable. By substituting text into programs, SAS macro variables make your pr...
%put before macro: var2=&var2; %macrocreate_local2; %let var1=local macro variable1; %local var2; %let var2=local macro variable2; %put inside macro: var1=&var1; %put inside macro: var2=&var2; %mendcreate_local2; %create_local2 %put after macro: var1=&var1; %put after ...
PUT语句会在日志窗口中展示下列信息 举例:宏函数%EVAL的使用 例1:%put eval(2+2)=% eval(2+2); 例2:%put eval(7/4)=% eval(7/4);--输出整数部分 1 例3:%put eval(10 gt 2)=% eval(10 gt 2);--逻辑表达式,输出结果1 例4:%put eval(2+2.1)=% eval(2+2.1);--报错,不是算术表达式,...
135 %macro t(i); 136 137 put &i.; 138 %mend; 139 140 data _null_; 141 set sashelp.class; 142 %t(name); SYMBOLGEN: Macro variable I resolves to name //宏变量I被解析成name,注意这个name不带双引号, MPRINT(T): put name; //这里put name和data set等一起被提交给sas执行 ...
Macro To Put Variable Labels Into A SAS® Data Set From A Crosswalk TableOftentimes, SAS(R) programmers encounter SAS(R) data sets entirely without variable labels, just variable names. If corresponding crosswalks exist and the task is to put variable labels into these data sets, then this ...
%macro wrttxt(text=Something we really want to write to the log!); %put text; %mend wrttxt; %wrttxt ; 在日志中的输出结果是text,而不是我们想得到的Something we really want to write to the log!原因是代码中没有在text前加’&’
Autocall Macro就可以解决这个问题,通过使用这种方式,会在调用宏的时候,SAS自动搜索相对应宏程序的代码,然后对其进行编译(在同个SAS会话中,只在第一次调用时编译,第二次调用会跳过编译过程),进而运行该宏。所以称之为Autocall。 此种方式又可以根据存储方式的不同分为两种,下面分别进行介绍。
/*方法2: macro variable*/ proc sql noprint; select catx(' = ', cats(AVISITN), quote(cats(AVISIT))) into :fmtlst separated by ' ' from demo order by AVISITN; quit; proc format; value vs2t &fmtlst; run; 通过CNTLIN=选项创建。
宏处理器(macro processor)会进行如下工作 examines these tokens requests additional tokens as necessary performs the action indicated. 对于宏变量,宏处理器会做以下几件事 creates a macro variable in the symbol table and assigns a value to the variable ...