WHICHN function syntax, usuage, example. (Also see WHICHC function)

是 否 +2 论坛币

k人 参与回答

经管之家送您一份

应届毕业生专属福利!

求职就业群

赵安豆老师微信：zhaoandou666

经管之家联合CDA

送您一个全额奖学金名额~ !

立即领取

感谢您参与论坛问题回答

经管之家送您两个论坛币！

+2 论坛币

Syntax WHICHN(argument, value-1 <, value-2, …> )

Required Arguments argument is a numeric constant, variable, or expression that specifies the value to search for.
value is a numeric constant, variable, or expression that specifies the value to be searched.



Details The WHICHN function searches the second and subsequent arguments for a value that is equal to the first argument, and returns the index of the first matching value.
If string is missing, then WHICHN returns a missing value. Otherwise, WHICHN compares the value of string with value-1, value-2, and so on, in sequence. If argument value-i equals string, then WHICHN returns the positive integer i. If string does not equal any subsequent argument, then WHICHN returns 0.
Using WHICHN is useful when the values that are being searched are subject to frequent change. If you need to perform many searches without changing the values that are being searched, using the HASH object is much more efficient.


Example The following example searches the array for the first argument and returns the index of the first matching value.

data _null_;
   array dates(*) Columbus Hastings Nicea US_Independence missing
                  Magna_Carta Gutenberg
                  (1492 1066 325 1776 . 1215 1450);
   x0=whichn(., of dates(*));
   x1=whichn(1492, of dates(*));
   x2=whichn(1066, of dates(*));
   x3=whichn(1450, of dates(*));
   x4=whichn(1000, of dates(*));
   put x0= / x1= / x2= / x3= / x4=;
run;
SAS writes the following output to the log:
x0=.
x1=1
x2=2
x3=7
x4=0

扫码加我 拉你入群

请注明：姓名-公司-职位

以便审核进群资格，未注明则拒绝

分享0 收藏0 回帖

关键词：function example SYNTAX Which ExamP first expression subsequent function

谢谢，学习了。

支持 留个水印