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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