set.seed(1)
datE<-data.frame(A=rnorm(30,0.5))
myArr=as.array(unlist(datE),dim=c(5,2,3))
myArr
A1 A2 A3 A4 A5
A6
-0.12645381 0.68364332 -0.33562861 2.09528080 0.82950777
-0.32046838
A7 A8 A9 A10 A11
A12
0.98742905 1.23832471 1.07578135 0.19461161 2.01178117
0.88984324
A13 A14 A15 A16 A17
A18
-0.12124058 -1.71469989 1.62493092 0.45506639 0.48380974
1.44383621
A19 A20 A21 A22 A23
A24
1.32122120 1.09390132 1.41897737 1.28213630 0.57456498
-1.48935170
A25 A26 A27 A28 A29
A30
1.11982575 0.44387126 0.34420449 -0.97075238 0.02184994
0.91794156
is.array(myArr)
[1] TRUE
dim(myArr)
[1] 30
myArr1=array(unlist(datE),dim=c(5,2,3))
myArr1
, , 1
[,1] [,2]
[1,] -0.1264538 -0.3204684
[2,] 0.6836433 0.9874291
[3,] -0.3356286 1.2383247
[4,] 2.0952808 1.0757814
[5,] 0.8295078 0.1946116
, , 2
[,1] [,2]
[1,] 2.0117812 0.4550664
[2,] 0.8898432 0.4838097
[3,] -0.1212406 1.4438362
[4,] -1.7146999 1.3212212
[5,] 1.6249309 1.0939013
, , 3
[,1] [,2]
[1,] 1.418977 0.44387126
[2,] 1.282136 0.34420449
[3,] 0.574565 -0.97075238
[4,] -1.489352 0.02184994
[5,] 1.119826 0.91794156
dim(myArr1)
[1] 5 2 3
A.K.
----- Original Message -----
From: David Winsemius <dwinsem...@comcast.net>
To: David Zastrau <dav...@tzi.de>
Cc: r-help@r-project.org
Sent: Monday, June 4, 2012 10:45 AM
Subject: Re: [R] Convert 2-dim array to 3-dim array
On Jun 4, 2012, at 5:08 AM, David Zastrau wrote:
Hello R-users,
I'd like to load data from a CSV-file to a 3-dimensional array.
However
the default seems to be 2-dimensional.
No. that is not the problem.
It would also be ok to load the
data and then convert it to a 3-dimensional structure.
I've been trying:
dat = read.csv(filename)
myArr = as.array(dat, dim = c(12,100,3))
However, I get an error message:
Error in `dimnames<-.data.frame`(`*tmp*`, value = list(n)) :
invalid 'dimnames' given for data frame
A dataframe is a list structure while both array and matrix are
expecting the first argument to be an atomic vector. Try this
(although it is a blind guess because you have not provided the
structure of 'dat'
myArr = as.array( unlist(dat), dim = c(12,100,3))
--David.
And I don't know how how to set the dimnames.
I would appreciate any help!
Best Wishes
Dave
[[alternative HTML version deleted]]
______________________________________________
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
David Winsemius, MD
West Hartford, CT
______________________________________________
R-help@r-project.org mailing list
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
