search for: prevfriday

Displaying 2 results from an estimated 2 matches for "prevfriday".

2004 Mar 01
6
Find out the day of week for a chron object?
I know that this is correct: library(chron) x = dates("01-03-04", format="d-m-y", out.format="day mon year") print(x) It gives me the string "01 Mar 2004" which is correct. I also know that I can say: print(day.of.week(3,1,2004)) in which case he says 1, for today is monday. My question is: How do I combine these two!? :-) I have a
2004 Mar 29
9
Aggregating frequency of irregular time series
...P as of this friday. i = i+7; # Get ready for the next time -- } return(100*diff(log(f.ltp), 1)); # Pretty computation of returns vector! :-) } ### --------------------------------------------------------------------------- # Compute the friday before the stated date. prevFriday <- function(x) { repeat { x <- x - 1; if (5 == with(month.day.year(x), day.of.week(month,day,year))) break; } return(x); } # Other tricks which could have worked also : # do.call( "day.of.week", month.day.year(x) ) # as.numeric(x-3)%%7 # uses fact that chron(3) is...