[R] add a special column to a matrix
Jim Lemon
drjimlemon at gmail.com
Wed Jul 8 12:32:16 CEST 2015
Hi Lida,
I think what you want is:
mat1<-read.table(text="a b c d
fg 1:23 dfgv 5
pt 10:18 tgtgh 1
wq 15:123 oiljk 6
fg 9:1323 ass 4
yr 12:123 kjjlk 5",header=TRUE)
mat2<-read.table(text="b q
1:23 0
10:18 1
14:455 2
15:123 2
9:1323 2
12:123 1
5:1548 0",header=TRUE)
merge(mat1,mat2,by="b")
You don't seem to have a column name for the first column in mat2, so
I have added one. If it is different from mat1, you will have to use a
slightly different "b" argument.
Jim
On Wed, Jul 8, 2015 at 4:06 PM, PIKAL Petr <petr.pikal at precheza.cz> wrote:
> Hi
>
> See answers in line
>
> From: Lida Zeighami [mailto:lid.zigh at gmail.com]
> Sent: Tuesday, July 07, 2015 10:20 PM
> To: PIKAL Petr
> Subject: Re: [R] add a special column to a matrix
>
>
> Hi Petr,
>
> Thanks, I can solve it!
> On Jul 7, 2015 11:05 AM, "Lida Zeighami" <lid.zigh at gmail.com<mailto:lid.zigh at gmail.com>> wrote:
> Hi Petr,
>
> Thank you so much for replying!
> I have two problems:
>
>
> 1. I couldn't understand what you mean "No HTML posting ", would you please explain more about that?
>
>> PLEASE do read the posting guide http://www.R-project.org/posting-
>> guide.html
>> and provide commented, minimal, self-contained, reproducible code.
>
>
> 2. still my problem hasn't been solved! I don't want to add the columns and rows of two matrices together!
> just I want to add the q column from mat2 to mat1 ( column b in mat1 and the rownames in mat1 are the same but not in a same order! )
>
> I should keep the mat1 and just add the value of rownames of mat2 to the equivalent elements in column b( I should add column q from mat2 to mat1 regarding the column b)
>
>
> Did you try read help page of merge command?
>
> Did you even try merge? If yes please describe what you do not like about it.
>
> merge(mat1, mat2, all.x=TRUE)
>
> shall take all lines of mat1 and add corresponding columns of mat2 to appropriate rows.
>
> However we do not know anything about your data. From your posting it seems to me that
>
> dim(mat1) results in c(n,4) and dim(mat2) results in (n,1) and what do you consider as a column in mat2 are row names. In that case you need to add a column of row names, maybe
>
> mat2$b <- rownames(mat2)
>
> before calling merge
>
> Cheers
> Petr
>
>
>
> head(mat1)
> a b c d
> fg 1:23 dfgv 5
> pt 10:18 tgtgh 1
> wq 15:123 oiljk 6
> fg 9:1323 ass 4
> yr 12:123 kjjlk 5
>
> my second matrix:
> head(mat2)
> q
> 1:23 0
> 10:18 1
> 14:455 2
> 15:123 2
> 9:1323 2
> 12:123 1
> 5:1548 0
>
> output should be :
> head(mat)
> a b c d q
> fg 1:23 dfgv 5 0
> pt 10:18 tgtgh 1 1
> wq 15:123 oiljk 6 2
> fg 9:1323 ass 4 2
> yr 12:123 kjjlk 5 1
>
> Thanks again,
> Lida
>
> On Tue, Jul 7, 2015 at 9:53 AM, PIKAL Petr <petr.pikal at precheza.cz<mailto:petr.pikal at precheza.cz>> wrote:
> Hi
>
> No HTML posting please, sometimes the mail is unreadable
>
> It is a work for merge.
>
> mat3 <- merge(mat1, mat2, all=TRUE)
>
> shall do the trick (untested)
>
> Cheers
> Petr
>
>
>> -----Original Message-----
>> From: R-help [mailto:r-help-bounces at r-project.org<mailto:r-help-bounces at r-project.org>] On Behalf Of Lida
>> Zeighami
>> Sent: Tuesday, July 07, 2015 4:43 PM
>> To: r-help at r-project.org<mailto:r-help at r-project.org>
>> Subject: [R] add a special column to a matrix
>>
>> Hi there,
>>
>> I have a two matrices which they have a common column! I want to add
>> the a column of second to matrix to the equivalent column of first
>> matrix!
>> my first matrix is
>> head(mat1)
>> a b c d
>> fg 1:23 dfgv 5
>> pt 10:18 tgtgh 1
>> wq 15:123 oiljk 6
>> fg 9:1323 ass 4
>> yr 12:123 kjjlk 5
>>
>> my second matrix:
>> head(mat2)
>> e q
>> 1:23 0
>> 10:18 1
>> 14:455 2
>> 15:123 2
>> 9:1323 2
>> 12:123 1
>> 5:1548 0
>>
>> mat1 and mat2 have a common column (b and e) but is not in the same
>> order, I want to add the q column from mat2 to be added to mat1 my
>> output will be:
>>
>> head(mat)
>> a b c d q
>> fg 1:23 dfgv 5 0
>> pt 10:18 tgtgh 1 1
>> wq 15:123 oiljk 6 2
>> fg 9:1323 ass 4 2
>> yr 12:123 kjjlk 5 1
>>
>> would you please let me know how to do it?
>>
>> Thanks
>>
>> [[alternative HTML version deleted]]
>>
>> ______________________________________________
>> R-help at r-project.org<mailto:R-help at r-project.org> mailing list -- To UNSUBSCRIBE and more, see
>> 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.
>
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> - a obsahuje-li nabídku, je adresát oprávněn nabídku bezodkladně přijmout; Odesílatel tohoto e-mailu (nabídky) vylučuje přijetí nabídky ze strany příjemce s dodatkem či odchylkou.
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> - odesílatel tohoto emailu informuje, že není oprávněn uzavírat za společnost žádné smlouvy s výjimkou případů, kdy k tomu byl písemně zmocněn nebo písemně pověřen a takové pověření nebo plná moc byly adresátovi tohoto emailu případně osobě, kterou adresát zastupuje, předloženy nebo jejich existence je adresátovi či osobě jím zastoupené známá.
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> ______________________________________________
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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.
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