search for: sitesurvey

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2012 Apr 05
0
Multi part problem...array manipulation and sampling
...s, sites, repeat counts within sites). Sampling effort per site varies so the array should be ragged. Maximum number of visits at any site = 22 Number of species = 161 Number of sites = 56 I generated the array first by; mydata<-tapply(spdata1$NTOTAL,list(spdata1$COUNT,spdata1$SPECIES,spdata1$SITESURVEY),sum) where spdata1$NTOTAL = number of detections spdata1$COUNT = repeat visit per site (max = 22) spdata1$SITESURVEY = site and survey period (=56) This gives me an array with dim (22,161,56), which is populated by either a number (NTOTAL), or an NA. I then converted the NAs to zeroes; mydata[i...
2012 Mar 25
2
avoiding for loops
I have data that looks like this: > df1 group id 1 red A 2 red B 3 red C 4 blue D 5 blue E 6 blue F I want a list of the groups containing vectors with the ids. I am avoiding subset(), as it is only recommended for interactive use. Here's what I have so far: df1 <- data.frame(group=c("red", "red", "red", "blue",