$date is a factor, which is coded as numeric values internally, which
as.date sees as numeric, and therefore:
"as.Date will accept numeric data (the number of days since an epoch),
but only if origin is supplied." (from ?as.Date)
You need to supply a format argument to as.Date to get it to handle
the factor properly; e.g.
"%d.%m.%Y" should work. See ?strptime for formatting details.
Bert Gunter
"The trouble with having an open mind is that people keep coming along
and sticking things into it."
-- Opus (aka Berkeley Breathed in his "Bloom County" comic strip )
On Sat, May 9, 2020 at 5:31 PM Medic <mailipadp...@gmail.com> wrote:
>
> I took a SAMPLE CODE (for Connected scatterplot) from the R gallery
> and applied to MY DATA, but got:
> "Error in as.Date.numeric(mydata$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
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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 -- To UNSUBSCRIBE and more, see
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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.
