Hi
> -----Original Message-----
> From: R-help [mailto:r-help-bounces at r-project.org] On Behalf Of
> rbalasus
> Sent: Monday, September 07, 2015 1:19 PM
> To: r-help at r-project.org
> Subject: [R] values in date format from .xls as label on x-line
>
>
> hello , I am very new to R, till now I was working with lineplots
> reading their data from .xls files. All was working as expected, now I
> want to label the data-values with "date"-values on the x line.
But I
> have absolute no clue how to read and interprete these values as date-
> values not just only integer, I was testing and searching solutions
> with the convert function. I hop I just need only one or two
> modifications in my code, and all is working. Any Ideas?
>
>
> this is my testcode, and the example values in the .xls, (with integer
> values, all is working correctly.)
>
>
> textcode.r
> require(XLConnect)
> wb = loadWorkbook("C:/xlsfile.xls")
> impdata = readWorksheet(wb, sheet = "Data", header = TRUE)
> datec(c) <- as.Date(impdata$date, "%d.%m.%y")
^^^^^^^^^^^
What is this? If you meant
datec <- as.Date(impdata$date, "%d.%m.%y")
datec shall be class Date, you can check it by
class(datec)
Maybe there shall be class mentioned on help page for mode and/or typeof in See
Also section.
As you did not provide any data here is toy example
datum <- structure(c(16359, 16361, 16362, 16363, 16364, 16365, 16366,
16367, 16368), class = "Date")
plot(datum, 1:9)
gives you a plot with x axes labeled by date. You can change format of x axis
plot(datum, 1:9, format="%d.%m.")
which gives you expected formatting although it issues set of warnings. I did
not found any plotting method for Date class although it (probably) works as
expected.
Cheers
Petr
> plot(datec,impdata$amount, main="amount year to
date",type="n",
> ylab="Eur",
> xlab="year to date",ylim=c(1,6000))
> lines(datec,impdata$amountmount, col = "steelblue")
>
> xls-file
> date amount
> 30.01.2015 1000
> 30.02.2015 2000
> 15.03.2015 2800
>
> THANX in advance for your help.
>
>
>
>
>
> --
> View this message in context: http://r.789695.n4.nabble.com/values-in-
> date-format-from-xls-as-label-on-x-line-tp4711949.html
> Sent from the R help mailing list archive at Nabble.com.
>
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