[R] Random sample from a data frame where ID column values don't match the values in an ID column in a second data frame

[inkhorn]

Hello,

Let's say I've drawn a random sample (sample1.df) from a large data frame
(main.df), and I want to create a second random sample (sample2.df) where
the values in its ID column *are not* in the equivalent ID column in the
first sample (sample1.df).  How would I go about doing this?

In other words:

The values in sample2.df$ID *are not found* in sample1.df$ID,  and both
samples are drawn from main.df.

Thanks in advance,
Matt Dubins

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