Hi,
?mat1<- matrix(log(1:20),ncol=5)
?exp(mat1)
#???? [,1] [,2] [,3] [,4] [,5]
#[1,]??? 1??? 5??? 9?? 13?? 17
#[2,]??? 2??? 6?? 10?? 14?? 18
#[3,]??? 3??? 7?? 11?? 15?? 19
#[4,]??? 4??? 8?? 12?? 16?? 20
mat2<- matrix(log2(1:20),ncol=5)
?2^mat2
#???? [,1] [,2] [,3] [,4] [,5]
#[1,]??? 1??? 5??? 9?? 13?? 17
#[2,]??? 2??? 6?? 10?? 14?? 18
#[3,]??? 3??? 7?? 11?? 15?? 19
#[4,]??? 4??? 8?? 12?? 16?? 20
A.K.
----- Original Message -----
From: JiangZhengyu <zhyjiang2006 at hotmail.com>
To: "r-help at r-project.org" <r-help at r-project.org>
Cc:
Sent: Monday, May 13, 2013 2:41 PM
Subject: [R] recover log of matrix
Dear all, I have a matrix with all values being log transformed.? I want them back to the values before the transformation.? i.e. 2^matrix M. Is there any easy code to do this? Thanks,Zhengyu ??? ??? ??? ? ??? ??? ?
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