[R] Split data frame by date (POSIXlt)

Hello everyone, I want to split a data.frame by the column date . The data frame looks like this date time openclose 02.01.201109:00:00 1000 1200 02.01.201109:05:02 1200 1203 ... 01.02.2011

[R] Escape sequence in eval ()

Hello, I am wondering how to get the quotation marks into a variable expression. I can't escape it with the backslash \ ... Example: I can access my data frame via TABLE$"2011-01-02"$columnD Now I want to do this automatically.. (with a for loop).. a <- TABLE b <- " \"20