Re: [R] computing differences between consecutive vector elements

From: Uwe Ligges <>
Date: Wed 28 Jul 2004 - 03:55:36 EST

Dewez Thomas wrote:
> Dear R-users,
> I am a newbie to R so please excuse this naive question for which I couldn't
> seem to find online answers.
> I have this data frame containing a series of locations through time
> (x,y,z,t). I would like to compute the difference in x, y and z between t-1
> and t.
> Sounds easy enough, but how on earth does one loop through vector elements
> and compute this difference?

See ?diff

Hence for a data frame X:
  lapply(X, diff)

Uwe Ligges

> Thanks
> Thomas
> ***
> Le contenu de cet e-mail et de ses pièces jointes est destiné à l'usage exclusif du
> (des) destinataire(s) expressément désigné(s) comme tel(s). En cas de réception de cet
> e-mail par erreur, le signaler à son expéditeur et ne pas en divulguer le contenu.
> L'absence de virus a été vérifié à l'émission du message. Il convient néanmoins de
> vérifier l'absence de corruption à sa réception.
> The contents of this email and any attachments are confidential. They are intended for
> the named recipient(s) only. If you have received this email in error please notify the
> system manager or the sender immediately and do not disclose the contents to
> anyone or make copies. eSafe scanned this email for viruses, vandals and malicious
> content.
> ***
> ______________________________________________
> mailing list
> PLEASE do read the posting guide! mailing list PLEASE do read the posting guide! Received on Wed Jul 28 04:02:11 2004

This archive was generated by hypermail 2.1.8 : Wed 03 Nov 2004 - 22:55:17 EST