[R] remove loop which compares row i to row i-1

Joshua Wiley jwiley.psych at gmail.com
Fri Jul 6 05:33:35 CEST 2012


Great chance to practice debugging.  Rather than trying one
complicated statement, break it into pieces.  The basic structure is:

results <- ifelse(condition, value if true, value if false)

Each argument needs to be a vector of the same length.  In your case,
condition itself consists of two vectors:

v1 >= v2

so try creating all four vectors and making sure they are what you
want and are the appropriate length.  Then:

results <- ifelse(v1 >= v2, VIT, VIF)

will work.



On Thu, Jul 5, 2012 at 3:52 PM, jcrosbie <james at crosb.ie> wrote:
> Thank you,
> I tired
>  ifelse(tUnitsort[length(tUnitsort$Hour),4]>=tUnitsort[-1,4],(tempMC
> =tUnitsort[length(tUnitsort$Hour),7]),tempMC )
> But this doesn't seem to work.
> Where am I going wrong?
> --
> View this message in context: http://r.789695.n4.nabble.com/remove-loop-which-compares-row-i-to-row-i-1-tp4635327p4635566.html
> Sent from the R help mailing list archive at Nabble.com.
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Joshua Wiley
Ph.D. Student, Health Psychology
Programmer Analyst II, Statistical Consulting Group
University of California, Los Angeles

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