Message-ID: <97051aa1-865c-6a8c-cf75-947a2cb8e34e@ntu.edu.tw>
Date: 2021-03-03T11:00:08Z
From: Steven Yen
Subject: Column-by-column division
I have a 10 x 2 matrix x. Like to divide the first column by s[1] and
second column by s[2]. The following lines work but are clumsy. Any
idea? Thanks.
> x
????? [,1] [,2]
?[1,]??? 1?? 11
?[2,]??? 2?? 12
?[3,]??? 3?? 13
?[4,]??? 4?? 14
?[5,]??? 5?? 15
?[6,]??? 6?? 16
?[7,]??? 7?? 17
?[8,]??? 8?? 18
?[9,]??? 9?? 19
[10,]?? 10?? 20
> s
[1] 1 2
> t(t(x)/s)
????? [,1] [,2]
?[1,]??? 1? 5.5
?[2,]??? 2? 6.0
?[3,]??? 3? 6.5
?[4,]??? 4? 7.0
?[5,]??? 5? 7.5
?[6,]??? 6? 8.0
?[7,]??? 7? 8.5
?[8,]??? 8? 9.0
?[9,]??? 9? 9.5
[10,]?? 10 10.0