Selecting Specific Dates in R

Question

I am wondering how to create a subset of data in R based on a list of dates, rather than by a date range.

For example, I have the following data set data wh

Answer 1

Lets assume your breezedate list looks like this and data$date is simple string:

  breezedate <- as.Date(c("2009-09-06", "2009-10-01"))

This is probably want you want:

  breezedays <- data[as.Date(data$date, '%m/%d/%Y') %in% breezedate]

Answer 2

The intersect() function (docs) will allow you to compare one data frame to another and return those records that are the same.

To use, run the following:

breezedays <- intersect(data$date,breezedate) # returns into breezedays all records that are shared between data$date and breezedate