SAS Programmer in CRO 来自专栏 · SAS in Pharma 19 人赞同了该文章 所谓的Macro Quoting,就是%STR, %NRSTR, %NRBQUOTE, %BQUOTE一类的Macro Function。介绍这类函数一个非常常见的例子是,假定想用%LET语句为宏变量a赋值1;2: %let a = 1;2; %put &a; === %let a = 1; 2; - 180 ERROR 180...
从这些例子中,可以看到一旦宏变量被任一quoting function作用之后,再次引用该宏变量就无需再次使用quoting function了。这表明,屏蔽的作用是持续的,这一点我们也多次在例子中利用SASHELP.VMACRO证明了(屏蔽作用实际上是以字符替代的形式存储起来的)。作为这个topic的结尾,下一节我们讨论一下quoting的作用范围和去作用化...
1.写关于macro quoting的总结是需要一点勇气的。 2.这个所谓的总结远远没有涵盖macro quoting所涉及到的全部问题,这篇文章的目的是让理解变得容易一点点。 3.文章中用到的例子,有的是借用了其他文章中的想法(比如Ian Whitlock 的A Serious Look at Macro Quoting)。有的例...
SAS学习笔记47 Macro Quoting 简单来说:Macro Quoting就是将具有特殊功能字符及字母组合的特殊功能隐藏掉。例如:让分号(;)不再表示一个语句的结束,而就是一个普普通通的字符;让GE不再表示大于等于的比较符,而就是两个普普通通的字母 %STR %STR宏函数是专门用于隐藏特殊字符及字母组合的特殊功能,该宏函数可以隐藏...
There are several macro quoting functions in SAS and even some experienced programmers can't distinguish them exactly. We usually look up the SAS help document when encountering some log issue during using. This article will summarize the difference and list some fallible situations. At the end, ...
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This was a change from SAS V5.18. At macro compilation time, the SAS Macro Facility should have only been evaluating %STR and %NRSTR quoting functions used in the default value expressions of keyword parameters. The correct time for full resolution of default keyword parameter expressions is at...
Quoting 4. Macro and data step functions and call routines 5. Debugging and tracing techniques 6. Autocall facilities 7. Design considerations 8. Alternatives to SAS macros 9. Changes and enhancements with Version 7 and 8 Introduction The SAS macro facility gives the SAS programmer some very ...
The %sysfunc() macro function lets you use data step functions in macro code. The optional second argument let's you control what format SAS uses to generate the string that is returned. The INTNX() function let's you calculate a change in date. The "..."d is how to represent a ...
and other similar operators can be used in SAS macros.II.Overview of elements of the macro languageThe three different main elements of the macro language are:▪macro variables;▪macro program statements;▪macro functions.III.Macro variablesMacro variables are tools that enable you to modify ...