2. RETAIN的作用:对于数据集中新声明的变量,SAS会在data步循环执行开始时将其置为空值,而如果该变量是retain的变量,则不被置空。 The RETAIN statement prevents SAS from re-initializing the values of new variables at the top of the DATA step.Previous values of retained variables are available for pro...
参考:Statements: RETAIN Statement - 9.2 (sas.com) Without a RETAIN statement, SAS automatically sets variables that are assigned values by an INPUT or assignment statement to missing before each iteration of the DATA step. The RETAIN statement causes the values of all variables that are created ...
Next, the SAS data is set up along with each step; after that, it will complete the data step iteration. The SAS outputs of the values assigned to the variables in the programming data vectors of the SAS data set, which is already created on the Output statement, allowed control of the...
We can see that the value of Var3 in the second observation is assigned the value of 10. This is done using the RETAIN statement. From the above examples, we can clearly see that the SAS RETAIN statement is used to maintain the current value of a variable through multiple iterations of ...
1. RETAIN语句 1.1 Example 1 先来看看在DATA步不使用和使用RETAIN语句的差异 没有使用RETAIN: DATA WITHOUT_1; PUT "Before the INPUT statement: " _ALL_; INPUT X @@; PUT "After the INPUT statement: "SAS中常见的数组函数 SAS中常见的数组函数有: dim dimk hbound hboundk lbound lboundk 数组...
set sashelp.class(keep = _numeric_); *只读入数值型变量; run; drop语句的用法和keep一样,套着用就行,另外drop=选项的效率也高于drop语句。 retain语句《不可执行的语句》retains values from the previous iteration of the DATA step 这个比较重要了,我先解释下sas的运行机制 ...
SAS retain语句组 我在一个小组里遇到麻烦了。假设我有一个数据集: data have_data; input dev nr amount flag $ ; cards; 1 1356 30000 S 2 1356 35000 S 3 1356 40000 L 4 1356 35000 S 1 2345 15000 S 2 2345 20000 S 3 2345 20000 S...
retain is redundant in : data a; array a a1 (0); retain a1; set sashelp.class end=done; a1 = a1 + 1; if done then put a1; run; PG 0 Likes Reply Astounding PROC Star Re: RETAIN statement Posted 06-16-2016 06:01 AM (1698 views) | In reply to dataMart87 All variabl...
A common requirement of data analysis is to identify an entity characteristic that is not explicit in the data but is derivable from it. The SAS RETAIN statement is a powerful and flexible tool for analysts and programmers with such a requirement. This paper introduces the RETAIN statement,...
This paper will focus on one of the mysteries - automatic retain in a data step. Wewill investigate how variables are automatically retained yet no retain statement is specified. Examples are provided todemonstrate the pitfalls one can experience when constructing a data step. Being cautious can ...