Am 10.05.20 um 04:17 schrieb Bert Gunter:
> $date is a factor, which is coded as numeric values internally, which
> as.date sees as numeric, and therefore:
> "as.Date will accept numeric data (the number of days since an epoch),
> but only if origin is supplied." (from ?as.Date)
as.Date is also able to read ISO date formatted strings by default (w/o
format).
as.Date("2013-04-28") works, as.Date("28.04.2013") not. The second
example needs as.Date("28.04.2013", format = "%d.%m.%Y").
>
> You need to supply a format argument to as.Date to get it to handle
> the factor properly; e.g.
> "%d.%m.%Y" should work. See ?strptime for formatting details.
>
> Bert Gunter
>
> "The trouble with having an open mind is that people keep coming along
> and sticking things into it."
> -- Opus (aka Berkeley Breathed in his "Bloom County" comic strip )
>
> On Sat, May 9, 2020 at 5:31 PM Medic <mailipadp...@gmail.com> wrote:
>>
>> I took a SAMPLE CODE (for Connected scatterplot) from the R gallery
>> and applied to MY DATA, but got:
>> "Error in as.Date.numeric(mydata$date) : 'origin' must be supplied".
>> P.S. I can not understand ?as.Date()
>>
>> SAMPLE CODE
>> library(ggplot2)
>> library(dplyr)
>> library(hrbrthemes)
>> data <-
>> read.table("https://raw.githubusercontent.com/holtzy/data_to_viz/master/Example_dataset/3_TwoNumOrdered.csv";,
>> header=T)
>>
>> str(data)
>> 'data.frame': 1822 obs. of 2 variables:
>> $ date : chr "2013-04-28" "2013-04-29" "2013-04-30" "2013-05-01" ...
>> $ value: num 136 147 147 140 126 ...
>>
>> data$date <- as.Date(data$date)
>>
>> # Plot
>> data %>%
>> tail(10) %>%
>> ggplot( aes(x=date, y=value)) +
>> geom_line( color="grey") +
>> geom_point(shape=21, color="black", fill="#69b3a2", size=6) +
>> theme_ipsum() +
>> ggtitle("Evolution of bitcoin price")
>>
>>
>> MY DATA
>> mydata <- read.table("E:/mydata.csv", header=TRUE, sep=";", dec=",")
>>
>> str(mydata)
>> 'data.frame': 7 obs. of 2 variables:
>> $ date : chr "01.01.2000" "02.01.2000" "03.01.2000" "04.01.2000" ...
>> $ value: int 11 12 13 14 15 16 17
>>
>> mydata$date <- as.Date(mydata$date)
>> Error in as.Date.numeric(mydata$date) : 'origin' must be supplied
>>
>> ______________________________________________
>> R-help@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@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@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.
