[R] row subtraction

[Ben Bolker]

Marsha Melnyk wrote:
> 
> I don't know if there is a way to do this in R but I want to subtract 
> within the same column from different rows.  I want to subtract 
> c(r)-c(r-1) and continue down the column until they are all calculated 
> and form another column. Again I don't know if R can do this but I 
> thought I would ask.
> 
> 

Can't tell quite what you want -- can you give an example?

Does apply(X,2,diff) do it?

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