[R] simple coversion of matrix rows to matrix columns

[arun]

Hi,


 is.matrix(a)
#[1] TRUE
#You don't need t(matrix(a))

t(a)
#     [,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9] [,10]
#[1,]    1    2    3    4    5    6    7    8    9    10
#[2,]   11   12   13   14   15   16   17   18   19    20
#[3,]   21   22   23   24   25   26   27   28   29    30
is.matrix(t(a))
#[1] TRUE


str(t(a))
# int [1:3, 1:10] 1 11 21 2 12 22 3 13 23 4 ...
str(t(matrix(a)) )
# int [1, 1:30] 1 2 3 4 5 6 7 8 9 10 ...

A.K.

----- Original Message -----
From: Andras Farkas <motyocska at yahoo.com>
To: "r-help at r-project.org" <r-help at r-project.org>
Cc: 
Sent: Wednesday, November 7, 2012 6:50 AM
Subject: [R] simple coversion of matrix rows to matrix columns

Dear All
 
I would like to convert matrix rows to columns. I am thinking the t() function should help, but am having a hard time converting the matrix into the dimensions I would like them to. Example:
 
a <-matrix(c(1:30),ncol=3) gives me:[,1] [,2] [,3]
 [1,]    1   11   21
 [2,]    2   12   22
 [3,]    3   13   23
 [4,]    4   14   24
 [5,]    5   15   25
 [6,]    6   16   26
 [7,]    7   17   27
 [8,]    8   18   28
 [9,]    9   19   29
[10,]   10   20   30
 
I would like to convert the above into a matrix that looks like this with 3 rows and 10 columns:
 
1     2   3   4   5   6   7   8   9  10
11   12  13  14  15  16  17  18  19  20
21   22  23  24  25  26  27  28  29  30
 
I have tried : 
b <-t(matrix(a))
 
but I am getting a 1X30 double matrix. I also Tried to specify 
b <-t(matrix(a),byrow=TRUE,ncol=10)
but that does not help either...
 
 
 
 
apreciate your help,
 
 
 
Andras
    [[alternative HTML version deleted]]


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