Actually my last reply will drop one row since its pushed off
to beyond the data range. You can avoid that with zooreg:
# from before for comparison
lag(z, -1, na.pad = TRUE)
# pure shift - note use of zooreg here
# Unlike lag.zoo, lag.zooreg can shift beyond data range
zr <- as.zooreg(z)
lag(zr, -1)
# lag.zooreg does not have an na.pad= arg but we
# can merge it with original times to get NA row.
merge(lag(zr, -1), zoo(, time(zr)))
On Thu, Jul 10, 2008 at 5:52 PM, Gabor Grothendieck
<[EMAIL PROTECTED]> wrote:
> 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 <[EMAIL PROTECTED]> 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 <[EMAIL PROTECTED]> 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
>>>> --
>>>> View this message in context:
>>>> http://www.nabble.com/shifting-data-in-matrix-by-n-rows-tp18368420p18368420.html
>>>> Sent from the R help mailing list archive at Nabble.com.
>>>>
>>>> ______________________________________________
>>>> R-help@r-project.org mailing list
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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.
>>>>
>>>
>>> ______________________________________________
>>> R-help@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@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.
>>
>
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