Hi R-help,
I have a dataframe consisting of a time-series [t, v]. The timestamps aren't
at all evenly spaced. The values are continuous. I've been able to graph
this as a step function (which is what it should be) in ggplot2, using the
'step' geom. Now I would like to take the integral of the step function.
For this and other reasons, is there a way to convert this into an evenly
time-interval-ed array?
example current dataframe:
t(currently as.POSIXct-ed) value
5/31/11 0:00 7.56
5/31/11 0:01 7.78
5/31/11 1:05 3.00
5/31/11 1:17 8.32
desired (something like this, anyway):
t value
5/31/11 0:00 7.56
5/31/11 0:05 7.78
5/31/11 0:10 7.78
... ...
5/31/11 1:00 7.78
5/31/11 1:05 3.00
5/31/11 1:10 3.00
5/31/11 1:15 3.00
5/31/11 1:20 8.32
It could also be factors like: 0:00 - 0:05, 7.56. However I don't think my
grasp of this is very good. It'd also be great if the solution were general
purpose so that I can change the parameters as needed (like interval size).
I've been banging my head on #R and begun reading plyr/reshape
documentation, so I would really appreciate any help!
-Derrick
[[alternative HTML version deleted]]
______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
