data tmp; set SASHELP.workers(firstobs=10 obs=15); where ELECTRIC > 260; run; proc print data = tmp; title 'WHERE Statement'; run; 运行结果(6条记录): 上述两种方法为什么输出结果不一样?请注意IF语句和WHERE语句的区别: (1)IF语句是面向“程序数据向量”(
IF condition THEN action; ELSE IF condition THEN action; ELSE action; 三. Subsetting Your Data 构造子集 在DATA STEP 使用: 构造子集 IF 语句. (subsetting IF statement) 语法:IF expression; 例: IF Sex = ' f ' ; IF expression; 这样的看起来有点怪,但是正确的. 表明: 当expressio...
if status="Open" and first.Site_Number then do; sitenum=0; end;sitenum+1;if status="Open" and last.Site_Number; run; I want to assign 0 for sitenum if status ne="Open" I wasn't successful when I did it by else if statement Please advise me for the best way to do it ...
1.1:The WHERE statement examines what is in the input page buffer and selects observations before they are loaded in the program data vector, which results in a savings in CPU operations(Where从buffer中进行筛选再读入pdv) The subsetting IF statement loads all observations sequentially into the pro...
在SAS中,可以使用IF语句来设置等于0或1的变量。IF语句是一种条件语句,根据条件的真假来执行不同的操作。 在SAS中,IF语句的基本语法如下: 代码语言:txt 复制 IF condition THEN do; statements; /* 如果条件为真,则执行这些语句 */ END; ELSE do; statements; /* 如果条件为假,则执行这些语句 */ END...
title'WHEREStatement'; run; 运行结果(6条记录): 上述两种方法为什么输出结果不一样?请注意IF语句和WHERE语句的区别: (1)IF语句是面向“程序数据向量”(ProgramDataVector)的,对当前PDV中的数据进行判断,满足条件时将其写入到外部数据集;WHERE语句也是面向PDV的,它使用于从外部数据源读数据到PDV之前进行判断,当满...
IF THEN/ELSE SAS程序中的循环结构通常为以下句式: IFexpressionTHEN statement;<ELSEstatement;> 其中expression指代判断条件,statement指代执行语句,可以是一句或者由DO-END结构所包围的执行语句 ELSE及其之后的执行语句可以不存在。 举个例子: 解释一下:Input语句指示程序连续读取cards后的数据作为x的变量值,每次读取时...
Of course, it is definitely ok that if we use “if…then/else”statement to complete this task. But I think we apply user-defined format is more efficient to handle this work. And programs are more easily to maintain if plenty of codes are r...
IF condition1 THEN statement1; ELSE IF condition2 THEN statement2; ELSE statement3; 例如,如果有一个名为grade的变量,我们可以使用以下语句判断成绩属于哪个等级,并输出相应的提示信息: 代码语言:txt 复制 IF grade >= 90 THEN put '优秀'; ELSE IF grade >= 80 THEN put '良好'; ELSE IF grade >=...
(from default missing to a valid value), at the first occurrence of a true IF statement: if hispang = 0 then do; if raceg = 1 then raceeth = 1; else if raceg = 2 then raceeth = 2; else raceeth = 3; end; else if hispang = 9 then raceeth = .N; else if hispang ge ...