[R] Date Column error: 'origin' must be supplied

[Achim Zeileis]

On Fri, 30 Dec 2016, Frederic Ntirenganya wrote:

> Hi All,
>
> I am creating date column on my data but getting the following error:
>
> #add date column dat1$Date=paste(as.Date(dat1$Year,dat1$Month,
> dat1$Day, sep="-"))Error in as.Date.numeric(origin, ...) : 'origin'
> must be supplied

You first need to paste() the character string and the coerce it with 
as.Date() - not the other way around:

as.Date(paste(dat1$Year, dat1$Month, dat1$Day, sep="-"))

>
>
> I will appreciate any help from you guys. Thanks.
> Here is the data.
>
>
> dput(head(dat1))structure(list(Year = c(1984L, 1984L, 1984L, 1984L, 1984L, 1984L
> ), Month = c(1L, 1L, 1L, 1L, 1L, 1L), Day = 1:6, WindSpeed = c(5L,
> 4L, 4L, 3L, 5L, 6L), Sunshine = c(6.3, 4.8, 0.6, 8.2, 7.3, 1.7
> ), Tmax = c(27.4, 26.3, 22.9, 27.7, 28.5, 25.5), Tmin = c(14.5,
> 16, 14.4, 14.8, 16.6, 15.4), Hmax = c(100L, 95L, 97L, 100L, 97L,
> 99L), Hmin = c(45L, 62L, 72L, 55L, 54L, 63L), Station.Name = structure(c(1L,
> 1L, 1L, 1L, 1L, 1L), .Label = "KIGALI AERO", class = "factor"),
>    Elevation = c(1490L, 1490L, 1490L, 1490L, 1490L, 1490L),
>    Longitude = c(30.11, 30.11, 30.11, 30.11, 30.11, 30.11),
>    Latitude = c(-1.95, -1.95, -1.95, -1.95, -1.95, -1.95)), .Names = c("Year",
> "Month", "Day", "WindSpeed", "Sunshine", "Tmax", "Tmin", "Hmax",
> "Hmin", "Station.Name", "Elevation", "Longitude", "Latitude"),
> row.names = c(NA,
> 6L), class = "data.frame")
>
>
> Best Regards,
>
> Fredo
>
>
> Frederic Ntirenganya
> Maseno University,
> African Maths Initiative,
> Kenya.
> Mobile:(+254)718492836
> Email: fredo at aims.ac.za
> https://sites.google.com/a/aims.ac.za/fredo/
>
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>
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