[R] isdst warning when rounding a range of time data: fix or suppress?

Hi, I'm working with timeseries data. The values are every 5 seconds and each series can last up to 4-5 days. To generate the x-axis labels, I'm doing the following: = # Variable for displaying hours on the x-axis rtime <<- as.POSIXct(round(range(timedata), "hours")) # V

[R] ctable error with Hmisc and Sweave (on a Mac)

Hi, pretty new with R and LaTeX here... I'm trying to use the latex() function from the Hmisc table with Sweave. When I try: pdflatex myfile.tex I get an error that reads: ! Undefined control sequence. l.22 \ctable It seems like this is an optional package for Tex that I haven't installed? M

[R] Accessing data in groups created with split() and other beginner questions

Hi, very new to R here... I have a data frame called 'set' with 100k+ rows in it that looks like this: subject timestamp yvalue traceabs subjtrace 1 1 1992-07-12 06:05:00 121 1-1 2 1 1992-07-12 06:10:00 151 1-1 3 1 1992-07-12 06

[R] Importing Time Series Data for an R Beginner

Hi, I'm trying to learn R for a project I'm working on. I know several programming languages, so I'm comfortable with the syntax. What I can't figure out is how to import the file of time series data that I have and parse it into individual series. The data was given to me in Excel, but I can o