Re: [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: fr...@aims.ac.za
https://sites.google.com/a/aims.ac.za/fredo/

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