[R] (no subject)

Tue Jan 31 15:18:26 CET 2017

Hi

Of course you have fewer values than in original data.

> x<-1:21

> length(rowSums(embed(x,3)))
[1] 19
> length(x)
[1] 21

> embed(x,3)
      [,1] [,2] [,3]
[1,]    3    2    1
[2,]    4    3    2
[3,]    5    4    3
[4,]    6    5    4
[5,]    7    6    5
[6,]    8    7    6
[7,]    9    8    7
[8,]   10    9    8
[9,]   11   10    9
[10,]   12   11   10
[11,]   13   12   11
[12,]   14   13   12
[13,]   15   14   13
[14,]   16   15   14
[15,]   17   16   15
[16,]   18   17   16
[17,]   19   18   17
[18,]   20   19   18
[19,]   21   20   19

You need to prepend or append 2 NA values if you want to add newly computed values to old data.

or extend your original vector by 2 values

length(rowSums(embed(c(NA, NA, x),3), na.rm=T))
[1] 21

Cheers
Petr

From: Kwesi Quagraine [mailto:starskykwesi at gmail.com]
Sent: Monday, January 30, 2017 6:29 PM
To: PIKAL Petr <petr.pikal at precheza.cz>
Cc: Jeff Newmiller <jdnewmil at dcn.davis.ca.us>; r-help at r-project.org
Subject: Re: [R] (no subject)

Upon trying this method, I get an error ;

Error in `$<-.data.frame`(`*tmp*`, "MEImeans", value = c(0.313162987462034,  :
  replacement has 442 rows, data has 444
Any thoughts?
Kwesi

On Mon, Jan 30, 2017 at 5:37 PM, PIKAL Petr <petr.pikal at precheza.cz<mailto:petr.pikal at precheza.cz>> wrote:
Hi

Probably just a small correction.

d3 <- embed( dta$MEI, 3)

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 Jeff
> Newmiller
> Sent: Monday, January 30, 2017 4:19 PM
> To: r-help at r-project.org<mailto:r-help at r-project.org>; Kwesi Quagraine <starskykwesi at gmail.com<mailto:starskykwesi at gmail.com>>
> Subject: Re: [R] (no subject)
>
> How you proceed depends on how consistent the data are and on what you
> want to do with those sets of three months after you have identified them.
>
> One approach is to create a matrix where each row contains the values
> corresponding to the "second previous", "previous", and "current" months
> data, respectively using the embed() function. The first two rows would be
> incomplete because the earlier data are missing there:
>
> d3 <- embed( dta$MEI )
>
> with which you could compute whatever metric you wanted. For example
> you could compute rolling means:
>
> dta$MEImeans <- rowMeans( d3 )
>
> If your data have missing rows you might need to use the aggregate or
> merge functions instead.
>
> For specific layouts of data or metrics you can find specialized functions in
> various packages. You might want to search using the R "sos" package or
> Google for your analysis method of choice.
> --
> Sent from my phone. Please excuse my brevity.
>
> On January 30, 2017 6:11:48 AM PST, Kwesi Quagraine
> <starskykwesi at gmail.com<mailto:starskykwesi at gmail.com>> wrote:
> >Hello, I have a data with two variables nodes and index, I want to
> >extract
> >3 months seasons, with a shift of 1 month, that is, DJF, JFM, FMA etc
> >to OND. Was wondering how to go about it. Kindly find data sample
> >below, data is in csv format.
> >Any help will be appreciated.
> >
> >My data sample;
> >
> >      era...1.    Node_freq           MEI
> >1   1980-01-01 -0.389855332  0.3394196488<tel:3394196488>
> >2 1980-02-01 -0<tel:2%20%20%201980-02-01%20-0>.728019153  0.2483738232<tel:2483738232>
> >3   1980-03-01 -1.992457784  0.3516954904
> >4   1980-04-01  0.222760284  0.5736836269
> >5   1980-05-01  0.972601798  0.6289249144
> >6   1980-06-01  0.570725954  0.5736836269
> >7   1980-07-01 -0.977966324  0.4120517119
> >8   1980-08-01  0.056128836 -0.0104418383
> >9   1980-09-01  0.987304573 -0.0687520861
> >10  1980-10-01  1.188242495 -0.1403611624
> >11  1980-11-01  1.693037763 -0.0963727298
> >12  1980-12-01  1.173539720 -0.2539126977
> >13  1981-01-01  0.423698206 -0.6140040528
> >14  1981-02-01 -2.208098481 -0.5209122536
> >15  1981-03-01 -0.786830252  0.1133395650
> >16  1981-04-01 -0.110502611  0.3302127675
> >17  1981-05-01 -1.272021820 -0.1894645290
> >18  1981-06-01  0.394292656 -0.3736021538
> >19  1981-07-01  1.452892441 -0.4032687711
> >20  1981-08-01  0.698150002 -0.4441882433
> >21  1981-09-01  0.997106423 -0.1720737534
> >22  1981-10-01  0.247264908 -0.2436828296
> >23  1981-11-01  0.771663876 -0.3909929295
> >24  1981-12-01 -0.316341458 -0.4943145967
> >
> >Regards,
> >Kwesi
> >
> >--
> >Try not to become a man of success but rather a man of value-Albert
> >Einstein
> >
> >University of Cape Coast|College of Agriculture and Natural
> >Sciences|Department
> >of Physics|
> >Team Leader|Recycle Up! Ghana|Technology Without Borders| Other
> emails:
> >kwesi.quagraine at ucc.edu.gh<mailto:kwesi.quagraine at ucc.edu.gh>|kwesi.quagraine at teog.de<mailto:kwesi.quagraine at teog.de>|
> >Mobile: +233266173582<tel:%2B233266173582>
> >Skype: quagraine_cwasi
> >Twitter: @Pkdilly
> >
> >     [[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.
>
> ______________________________________________
> 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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Odesílatel e-mailu neodpovídá za eventuální škodu způsobenou modifikacemi či zpožděním přenosu e-mailu.

V případě, že je tento e-mail součástí obchodního jednání:
- vyhrazuje si odesílatel právo ukončit kdykoliv jednání o uzavření smlouvy, a to z jakéhokoliv důvodu i bez uvedení důvodu.
- 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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