Re: [R] expanding a presence only dataset into presence/absence

lmi 3641 3/23/2001    1   1 #14    Pseudacris kalmi 3641 4/27/2001    0   0 A.K. From: Matthew Venesky To: arun Sent: Monday, April 29, 2013 3:54 PM Subject: Re: [R] expanding a presence only dataset into presence/absence Arun,

Re: [R] expanding a presence only dataset into presence/absence

d(unique(dat1$Species),unique(dat1$Site),unique(dat1$Date)) >>> colnames(dat2)<- colnames(dat1) >>>res<-merge(dat1,dat2,by=c("Species","Site","Date"),all=TRUE) >>>res[is.na(res)]<- 0 >>> res<-res[order(res$Date),] >>&g

Re: [R] expanding a presence only dataset into presence/absence

: Matthew Venesky To: r-help@r-project.org Cc: Sent: Monday, April 29, 2013 11:12 AM Subject: [R] expanding a presence only dataset into presence/absence Hello, I'm working with a very large dataset (250,000+ lines in its' current form) that includes presence only data on various speci

Re: [R] expanding a presence only dataset into presence/absence

> -Original Message- > From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] > On Behalf Of Matthew Venesky > Sent: Monday, April 29, 2013 8:13 AM > To: r-help@r-project.org > Subject: [R] expanding a presence only dataset into presence/absence &g

[R] expanding a presence only dataset into presence/absence

Hello, I'm working with a very large dataset (250,000+ lines in its' current form) that includes presence only data on various species (which is nested within different sites and sampling dates). I need to convert this into a dataset with presence/absence for each species. For example, I would lik