[R] How do I subtract sequential values ?

[eric]

Just starting to learn R so excuse me if this is a simple question. I'm
wondering how I get the percent difference in sequential values in one
column of a dataframe. If I had a dataframe and one of the columns was
"value", how would I go about calculating  (v2-v1)/v1 ....(v3-v2)/v2
....(v4-v3)/v3 ...etc ?
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