Looping over a Date or POSIXct object results in a numeric iterator

by

?"for" says that seq (the part after in) is “[A]n expression evaluating to a vector (including a list and an expression) or to a pairlist or ‘NULL'”.

So your Date vector is being coerced to numeric because Date objects aren’t strictly vectors:

is.vector(Sys.Date())
# [1] FALSE
is.vector(as.numeric(Sys.Date()))
# [1] TRUE

The same is true for POSIXct vectors:

is.vector(Sys.time())
# [1] FALSE
is.vector(as.numeric(Sys.time()))
# [1] TRUE

More Related Contents:

  1. Extracting time from POSIXct
  2. Convert Factor to Date/Time in R
  3. Round a POSIX date (POSIXct) with base R functionality
  4. How to create a loop that will make regression models in R? [closed]
  5. Transform year/week to date object
  6. “for” loop only adds the final ggplot layer
  7. Axis labels on two lines with nested x variables (year below months)
  8. What are the “standard unambiguous date” formats for string-to-date conversion in R?
  9. How to change multiple Date formats in same column?
  10. How R formats POSIXct with fractional seconds
  11. How to get week numbers from dates?
  12. Extract month and year from a zoo::yearmon object
  13. How to get a vertical geom_vline to an x-axis of class date?
  14. How to subtract/add days from/to a date?
  15. Formatting dates with scale_x_date in ggplot2
  16. Convert a numeric month to a month abbreviation
  17. Difference between as.POSIXct/as.POSIXlt and strptime for converting character vectors to POSIXct/POSIXlt
  18. Convert four digit year values to class Date
  19. Same function over multiple data frames in R
  20. Convert string to date, format: “dd.mm.yyyy”
  21. Convert yyyymmdd string to Date class in R
  22. Format date as Year/Quarter
  23. Loop in R: how to save the outputs?
  24. Converting a character string into a date in R
  25. Create end of the month date from a date variable
  26. R: Break for loop
  27. Converting numeric time to datetime POSIXct format in R
  28. How to convert a date from a character string?
  29. Get date difference in years (floating point)
  30. Enclosing variables within for loop

Leave a Comment