Hi R mailing list, probably a very basic problem here, I try to do the following:
> Q<-c(1,2,3) > P<-c(4,5,6) > A<- data.frame(Q,P) > A Q P 1 1 4 2 2 5 3 3 6 this is my simplified data.frame (matrix) now I try to create following loop for subtraction of element within the data.frame: > for(i in length(A[,"P"]-1){ delta[i]<- A[i,"P"]-A[i+1,"P"] } All I get is a vector of the correct length but with no readings. Thanks for any help on this. -- Niklaus Hürlimann Université de Lausanne Institut de Minéralogie et Géochimie L'Anthropole CH-1015 Lausanne Suisse E-mail: niklaus.hurlim...@unil.ch Tel:+41(0)21 692 4452 [[alternative HTML version deleted]]
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