r - plotting data with a series of start end dates -
how go plotting data series of start end date bands? i have dataframe looks like: start<-as.posixct(c("2017-07-13 01:40:00 mdt", "2017-07-21 06:00:00 mdt", "2017-07-21 14:00:00 mdt", "2017-07-24 11:00:00 mdt", "2017-07-24 12:00:00 mdt", "2017-07-25 05:00:00 mdt", "2017-07-25 17:00:00 mdt", "2017-07-26 12:00:00 mdt", "2017-07-30 12:00:00 mdt", "2017-07-31 04:00:00 mdt", "2017-07-31 15:00:00 mdt", "2017-08-03 18:30:00 mdt", "2017-08-03 23:30:00 mdt", "2017-08-09 05:00:00 mdt", "2017-08-09 20:00:00 mdt", "2017-08-14 09:00:00 mdt", "2017-08-16 05:00:00 mdt", "2017-08-16 07:00:00 mdt", "2017-08-16 19:00:00 mdt", "2017-08-17 18:00:00 mdt", "2017-08-20 05:00:00 mdt", "2017-08-23 06:00:00 mdt", "2017-08-23 14:00:00 mdt...