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date_trans
2016 Apr 18
0
Add a vertical arrow to a time series graph using ggplot and xts
...o up) to a time series plot using ggplot2 and xts. It seems that the
vertical line command "geom_vline" does not work for this purpose (Correct
me if I am wrong). I try the command "geom_segment" as follows, but I got
an error message at the last line "Error: Invalid input: date_trans works
with objects of class Date only".
Sometimes the error message occurs when I run the program, sometimes it
does not occur until I call the plot "p1". How could I add a vertical line
to the plot? Thanks!
Miao
######################
library(xts) # primary
#library(tserie...