R help - Mar 2013 - Introduction to R. Any such documentation in Vietnamese?

Dear fellow users

Are there any Vietnamese language resources for beginners of R?  If so, I would
be interested in hearing from people who have had experience with them and which
are better (if there is more than one).  I am involved with an aid project in
Vietnam, and would like to move the scientists involved from using Excel for
'analysis' to R.

Thanks ....

Peter Alspach

The contents of this e-mail are confidential and may be ...{{dropped:17}}

Here are the code and results
===========> a=matrix(1:20,5)
> a
     [,1] [,2] [,3] [,4]
[1,]    1    6   11   16
[2,]    2    7   12   17
[3,]    3    8   13   18
[4,]    4    9   14   19
[5,]    5   10   15   20
> colnames(a)=c("A","AB","C","CD")
> a
     A AB  C CD
[1,] 1  6 11 16
[2,] 2  7 12 17
[3,] 3  8 13 18
[4,] 4  9 14 19
[5,] 5 10 15 20
> group=factor(substring(colnames(a),1,1))
> group
[1] A A C C
Levels: A C
> a[,levels(group)=="A"]
     A  C
[1,] 1 11
[2,] 2 12
[3,] 3 13
[4,] 4 14
[5,] 5 15
> a[,levels(group)=="C"]
     AB CD
[1,]  6 16
[2,]  7 17
[3,]  8 18
[4,]  9 19
[5,] 10 20

=============But, I was expect that:
a[,levels(group)=="A"]
     A  AB
[1,] 1 6
[2,] 2 7
[3,] 3 8
[4,] 4 9
[5,] 5 10

Could anybody explain why? Thanks a lot!!
	[[alternative HTML version deleted]]

levels(group)
#[1] "A" "C"
?levels(group)=="A"
#[1]? TRUE FALSE
a[,group=="A"]
#???? A AB
#[1,] 1? 6
#[2,] 2? 7
#[3,] 3? 8
#[4,] 4? 9
#[5,] 5 10
a[,group=="C"]
#????? C CD
#[1,] 11 16
#[2,] 12 17
#[3,] 13 18
#[4,] 14 19
#[5,] 15 20
a[,match(group,levels(group))==1]
#???? A AB
#[1,] 1? 6
#[2,] 2? 7
#[3,] 3? 8
#[4,] 4? 9
#[5,] 5 10




A.K.



----- Original Message -----
From: capricy gao <capricyg at yahoo.com>
To: r-help <r-help at r-project.org>
Cc: 
Sent: Tuesday, March 19, 2013 9:19 PM
Subject: [R] How to subsetting data based on factor levels



Here are the code and results
===========> a=matrix(1:20,5)
> a
???? [,1] [,2] [,3] [,4]
[1,]??? 1??? 6?? 11?? 16
[2,]??? 2??? 7?? 12?? 17
[3,]??? 3??? 8?? 13?? 18
[4,]??? 4??? 9?? 14?? 19
[5,]??? 5?? 10?? 15?? 20
> colnames(a)=c("A","AB","C","CD")
> a
???? A AB? C CD
[1,] 1? 6 11 16
[2,] 2? 7 12 17
[3,] 3? 8 13 18
[4,] 4? 9 14 19
[5,] 5 10 15 20
> group=factor(substring(colnames(a),1,1))
> group
[1] A A C C
Levels: A C
> a[,levels(group)=="A"]
???? A? C
[1,] 1 11
[2,] 2 12
[3,] 3 13
[4,] 4 14
[5,] 5 15
> a[,levels(group)=="C"]
???? AB CD
[1,]? 6 16
[2,]? 7 17
[3,]? 8 18
[4,]? 9 19
[5,] 10 20

=============But, I was expect that:
a[,levels(group)=="A"]
???? A? AB
[1,] 1 6
[2,] 2 7
[3,] 3 8
[4,] 4 9
[5,] 5 10

Could anybody explain why? Thanks a lot!!
??? [[alternative HTML version deleted]]


______________________________________________
R-help at r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.

There is a contributed section on the http://cran.r-project.org/. Go to
it, there is a vietnamese document to introduce R.

Alain Guillet

On 20/03/2013 02:06, Peter Alspach wrote:
> Dear fellow users
>
> Are there any Vietnamese language resources for beginners of R?  If so, I
would be interested in hearing from people who have had experience with them and
which are better (if there is more than one).  I am involved with an aid project
in Vietnam, and would like to move the scientists involved from using Excel for
'analysis' to R.
>
> Thanks ....
>
> Peter Alspach
>
> The contents of this e-mail are confidential and may be ...{{dropped:17}}
>
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>
-- 
Alain Guillet
Statistician and Computer Scientist

SMCS - IMMAQ - Universit? catholique de Louvain
http://www.uclouvain.be/smcs

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