R help - Nov 2007 - cumsum

Hi, my problem belongs to the basic ones. I want to get cumulated sum over
the matrix columns by one command (if such exists). Ordinary R's cumsum(x)
when x is:
     [,1] [,2]
[1,]    1    5
[2,]    2    6
[3,]    3    7
[4,]    4    8

yields:  1  3  6 10 15 21 28 36
I want:
     [,1] [,2]
[1,]    1    5
[2,]    3   11
[3,]    6   18
[4,]   10   26
Is there any command to do so??

best, robert



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threshold said the following on 11/3/2007 4:41 AM:
> Hi, my problem belongs to the basic ones. I want to get cumulated sum over
> the matrix columns by one command (if such exists). Ordinary R's
cumsum(x)
> when x is:
>      [,1] [,2]
> [1,]    1    5
> [2,]    2    6
> [3,]    3    7
> [4,]    4    8
> 
> yields:  1  3  6 10 15 21 28 36
> I want:
>      [,1] [,2]
> [1,]    1    5
> [2,]    3   11
> [3,]    6   18
> [4,]   10   26
> Is there any command to do so??
> 
> best, robert
> 
> 
> 
Try

apply(x, 2, cumsum)

HTH,

--sundar

apply(matrix, 2, cumsum)


------------------------------------------------------------------------
----
ir. Thierry Onkelinx
Instituut voor natuur- en bosonderzoek / Research Institute for Nature
and Forest
Cel biometrie, methodologie en kwaliteitszorg / Section biometrics,
methodology and quality assurance
Gaverstraat 4
9500 Geraardsbergen
Belgium 
tel. + 32 54/436 185
Thierry.Onkelinx op inbo.be 
www.inbo.be 

Do not put your faith in what statistics say until you have carefully
considered what they do not say.  ~William W. Watt
A statistical analysis, properly conducted, is a delicate dissection of
uncertainties, a surgery of suppositions. ~M.J.Moroney

-----Oorspronkelijk bericht-----
Van: r-help-bounces op r-project.org [mailto:r-help-bounces op r-project.org]
Namens threshold
Verzonden: zaterdag 3 november 2007 12:42
Aan: r-help op r-project.org
Onderwerp: [R] cumsum


Hi, my problem belongs to the basic ones. I want to get cumulated sum
over the matrix columns by one command (if such exists). Ordinary R's
cumsum(x) when x is:
     [,1] [,2]
[1,]    1    5
[2,]    2    6
[3,]    3    7
[4,]    4    8

yields:  1  3  6 10 15 21 28 36
I want:
     [,1] [,2]
[1,]    1    5
[2,]    3   11
[3,]    6   18
[4,]   10   26
Is there any command to do so??

best, robert



--
View this message in context:
http://www.nabble.com/cumsum-tf4742648.html#a13562053
Sent from the R help mailing list archive at Nabble.com.

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