%substr函数:用于文本处理的宏函数 /*例16.28 用%substr函数生成某字符串的子串。*/ data %substr(&sysday,1,3); run; 用%QOUTE函数引用一个可分辩的值 /*例16.29 用%QOUTE函数引用一个可分辩的值。*/ %macro dept(X); %if %quote(&X)=fn %then %put Financial Dep
宏又分为macro 1和macro function. 如何自己定义macro function还没搞懂。 1.宏变量 A macro variable does not belong to a data set, and its value is always character. This value could be a variable name, a numeral, or any text that you want substituted into your program. (宏变量不属于数据...
<variable=>SUBSTR(string, position<,length>) Details In a DATA step, if the SUBSTR (right of =) function returns a value to a variable that has not previously been assigned a length, then that variable is given the length of the first argument. The ...
例如,SUBSTR函数可以通过指定起始位置和长度来截取字符串的右边部分。假设你有一列数据,每个单元格包含一个字符串,你希望提取每个字符串的后三个字符,你可以使用SUBSTR函数:new_variable = substr(old_variable, length(old_variable)-2, 3);。通过这种方式,你可以从右边提取数据并进一步进行分析。 一、SUBSTR函数的...
SYMBOLGEN: Macro variable STARTYR resolves to 2008 ERROR: Required operator not found in expression: substr("2008",3,2) SYMBOLGEN: Macro variable NXTYR resolves to 2009 ERROR: Required operator not found in expression: substr("2009",3,2) ERROR: Required operator not found in expression: cat...
The SAS macro function %SYSFUNC is very useful because it makes possible the use of SAS data step functions in the SAS macro environment. However, when the argument in the nested SAS data step function contains a macro variable or another macro such as %sysfunc(substr(&&AB&C,1)), it is...
比如考了transpose(需要根据transpose后的表格写proc transpose的代码),merge(需要用到in=),macro variable(考了define和reference),还有一个manipulate characters的题目,需要用到substr()和如何remove leading blanks之类的操作。 选择题:选择题都是70题里的变形题,data infile没有遇到(好像是已经不考了?),missover ...
%SYMEXIST(macro-variable-name)宏函数用于判断一个宏变量是否存在,其参数为宏变量名。若该宏变量存在,则返回1;否则,返回0 %SYMGLOBL(macro-variable-name)宏函数用于判断一个宏变量是否是全局宏变量,即是否存在于Global Symbol Table中。如果是全局宏变量,则返回1;否则返回0 ...
call symputx(‘macro_variable’, symbolic_reference_value,’g’); マクロ変数が、CALL SYMPUTルーチンと同じステップで使用されています。 CALL SYMPUTにより作成されたマクロ変数を置換する前に、RUNステートメントのようなステップ境界に到達する必要があります。 マクロの置換は、マクロ変数が...
%* Why? because a macro is not allowed to create a macro variable %* in a local scope above its own. %* (It may however, access any macro variables in scope above itself) %* If this macro implicitly 'creates' a macro variable, it will ...