Beware of Sys.Date, since it returns GMT, so depending on your local timezone
you may be surprised by the result. I prefer to explicitly set the TZ
environment variable and use Sys.time to get local time. You can use trunc() to
chop off the time part.
I would start with this example, which is available from base R, without
additional packages, to help understand the suggestions that follow.
> unclass(as.POSIXlt(Sys.Date()))
$sec
[1] 0
$min
[1] 0
$hour
[1] 0
$mday
[1] 5
$mon
[1] 10
$year
[1] 114
$wday
[1] 3
$yday
[1] 308
$isdst
[1] 0
at
rg
Subject: Re: [R] Function that create day of the year column.
Dear PIKAL,
I am using a data frame not a single value. I wanted to add a new column "DOY"
on a dataset. I made it but I want to make it General. i.e. You will see in the
dataset I am using columns names (Year,month and day.)
361] 362 363 364 365 366
>
> But length of dt stays the same
> length(dt)
> [1] 365
>
> Cheers
> Petr
>
> > >> cbind(data, dt) # combining columns of data
> > >> conames(data)="DOY" # name of new column. ??I have a problem on
> > how
&
> I can precise the column in gerenal.
> >> }
> >>
> >>
> -Original Message-
> From: r-help-boun...@r-project.org [mailto:r-help-bounces@r-
> project.org] On Behalf Of Frederic Ntirenganya
> Sent: Tuesday, November 04, 2014 1:31 PM
> To: daniel
Maybe, you can add a parameter with a list of the column names and inside
the function an if statement, if the list lenght is 1 use the function with
1 column else the 3 columns. I am sure you can find better solutions.
Daniel Merino
2014-11-04 9:30 GMT-03:00 Frederic Ntirenganya :
> Hi Daniel,
Hi Daniel,
How can I add an if conditiopn or for loop to implement this in my
function?
ex: option1 : single date
option2: date in 3 columns (year,moth,day)
yday(Sys.Date())
yday(as.Date(paste(y,m,d,sep="-")))
Regards,
Frederic.
Frederic Ntirenganya
Maseno University,
African Maths Initi
Frederic,
Check the lubridate library.
install.packages("lubridate")
library(lubridate)
yday(Sys.Date())
d <- 4
m <- 11
y <- 2014
yday(as.Date(paste(y,m,d,sep="-")))
Daniel Merino
2014-11-04 7:01 GMT-03:00 Frederic Ntirenganya :
> Dear All,
>
> I would like to make a function that create Day o
Dear All,
I would like to make a function that create Day of the year column in a
dataset.
State of the problem: write a function that create a day column either from
a single date column (string/or factors) or from date in 3 columns (year,
month, day).
I made the following function for a single
Dear All,
I would like to make a function that create Day of the year column in a
dataset.
State of the problem: write a function that create a day column either from
a single date column (string/or factors) or from date in 3 columns (year,
month, day).
I made the following function for a single
10 matches
Mail list logo
