Vectors are not matrices in R, though matrices are special cases of vectors.

See ?diff for a solution that works with vectors.
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Sent from my phone. Please excuse my brevity.

Alaios <alaios@yahoo.com> wrote:

Dear all,
I have a matrix with data and I want to substract from every value the previous element.

Let's assume that my vector(matrix) is c<-(1,2,3,4,5)
I want to get remove_previous c<-(0,1,2,3,4).

How I can do that efficiently in R?

I would like to thank you in advance for your help
B.R
Alex

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