subset dataframe by rows using character vector?

Dear List,

I'm stuck on what seems like a simple indexing problem, I'd be very  
grateful to anyone willing to help me out.

I queried a dataframe which returns a character vector called  
"plot". I have another dataframe from which I want to subset or  
select only those rows that match "plot". I've tried subset, and  
also the "which" command.


plot <- c("plot1", "plot2", "plot3")                   # character  
vector used to select rows from data

# create fake data from to try out subset
v1 <- c(2,5,6,4,3)
PLOTID <- c("plot1", "plot2", "plot3", "plot4", "plot5")
full.data <- cbind(v1, PLOTID)
full.data <- as.data.frame(full.data)

# first attempt
test <- which(full.data$PLOTID == plot)

# second attempt
test <- full.data[full.data$PLOTID == plot]


I'm sure there is a simple solution here, but I'm unable to figure  
it out.

Thanks for any suggestions,

Zack