[R] shifting data in matrix by n rows

[Gabor Grothendieck]

See ?lag and in zoo ?lag.zoo.  Both pages have
examples. Using lag.zoo here it is with your data:

Lines <- "Date   Apples   Oranges   Pears
1/7     2          3            5
2/7     1          4            7
3/7     3          8            10
4/7     5          7            2
5/7     6          3            5"

library(zoo)

# z <- read.zoo("myfile.dat", header = TRUE, format = "%d/%m")
z <- read.zoo(textConnection(Lines), header = TRUE, format = "%d/%m")

lag(z, -1, na.pad = TRUE)

On Thu, Jul 10, 2008 at 3:12 PM, rcoder <michael.larsson at gmail.com> wrote:
>
> Hi everyone,
>
> Thanks very much for all your replies.
>
> I'm interested in hearing more about the lag function. I remember coming
> across this in the R intro manual, but I couldn't figure out how to apply it
> to my case. Does anyone know how it is applied, assuming a time series data
> frame?
>
> Thanks,
>
> rcoder
>
>
>
> Gabor Grothendieck wrote:
>>
>> If its a zoo or ts time series you can use the lag function.
>>
>> On Wed, Jul 9, 2008 at 2:57 PM, rcoder <michael.larsson at gmail.com> wrote:
>>>
>>> Hi everyone,
>>>
>>> I have some data in a matrix, and I want to shift it down by one row. The
>>> matrix in question has a date column. Does anyone know of a way to shift
>>> the
>>> data by one row, whilst preserving the date column in the matrix - i.e.
>>> shift the data and leave the date column in the current location?
>>>
>>> Thanks,
>>>
>>> rcoder
>>> --
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>>
>> ______________________________________________
>> 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.
>>
>>
>
> --
> View this message in context: http://www.nabble.com/shifting-data-in-matrix-by-n-rows-tp18368420p18389841.html
> Sent from the R help mailing list archive at Nabble.com.
>
> ______________________________________________
> 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.
>