How to plot only a specific range of data in R

Question

I have a simple syntax question for an absolute beginner. I have been searching and experimenting and I can't figure it out. I need to only plot values from the variable SIZE that are greater than 0.8, but less than seven. I am using the with() expression along with plot(). Can someone tell me how I should write this?

with(dat[SIZE <7 | SIZE > 0.8  ,], plot(SP.RICH~SIZE))

Thank You.

Answer 1

Selecting only certain rows is called filtering .

One way is to use dplyr, it's a nicer idiom:

require(dplyr)
dat %>% filter(SIZE>0.8 & SIZE<7) %>%
plot(SP.RICH~SIZE, data = .)

Another is data.table package.