Hi,
This seems like there should be a simple answer, but having spent most of
the day trying to find it, I'm becoming less convinced and as such am asking
it here.
Here's a sub-set of my data (a data.frame in R):
myDF
time value trial
1 2011-03-01 01:00:00 64092 FALSE
2 2011-03-01 02:00:00 47863 FALSE
3 2011-03-01 03:00:00 43685 FALSE
4 2011-03-01 04:00:00 44821 TRUE
5 2011-03-01 05:00:00 48610 TRUE
6 2011-03-01 06:00:00 44856 TRUE
7 2011-03-01 07:00:00 55199 TRUE
8 2011-03-01 08:00:00 69326 FALSE
9 2011-03-01 09:00:00 84048 FALSE
10 2011-03-01 10:00:00 81341 FALSE
>From this, I can plot a simple time-series in ggplot:
ggplot(myDF, aes(time,value)) + geom_line()
but I'd like to change the colour of the line based on whether the trial
value is TRUE or FALSE, so I try:
ggplot(myDF, aes(time,value)) + geom_line(aes(colour=trial))
but this draws a line from the value on row 3 to that on row 8 (essentially
plotting TRUE and FALSE as separate data-sets). I've tried using various
other geometries (inc. geom_path()) but all have produced similar events.
Is there a way I can plot the time-series in a continuous way (i.e. as one
data-set) and change only the colour of the line?
Thanks,
Joe
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