Displaying 3 results from an estimated 3 matches for "firstdate".
2001 Feb 13
0
handle date variables
...2. How to convert a string into a date value. For
example, convert 20010122
to 2001 Jan 22, and get its day of the week, i.e.
Monday?
3. How to handle date variables in a loop? How to make
the following codes work? And how users should pass
the date arguments to the function?
fun1 <- function(firstdate, lastdate) {
for ( i in firstdate:lastdate) {
do something....
}
}
fun1(2001/01/22, 2001/01/27)
--- Douglas Bates <bates at stat.wisc.edu> wrote:
> Yu-Ling Wu <yuling5 at yahoo.com> writes:
>
> > I'd like to pass a string to a function as the
>...
2011 Feb 09
1
Iterate over a list of input files?
...in the directory tested and augment the
data frame I'm building to have more results columns.How can I do
that?
Here's the code:
library(chron) # .Holidays / is.holiday / is.weekend
TStoDate = function (TSDate) {
X = strptime(TSDate + 19e6L, "%Y%m%d")
return(as.Date(X))
}
FirstDate = 1090601
LastDate = 1101101
StartDate = TStoDate(FirstDate)
EndDate = TStoDate(LastDate)
# Create a sequence of days from start to finish
# Then remove weekends and holidays and turn into a data.frame
dd <- seq(StartDate, EndDate, by = "day")
TradingDate <- dd[!is.weekend(dd) &a...
2013 Feb 11
2
Inserting rows of interpolated data
Dear help list - I have light data with 5-min time-stamps. I would like to insert four 1-min time-stamps between each row and interpolate the light data on each new row. To do this I have come up with the following code:
lightdata <- read.table("Test_light_data.csv", header = TRUE, sep = ",") # read data file into object "lightdata"
library(chron)
mins <-