Displaying 2 results from an estimated 2 matches for "sitesurvey".
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limesurvey
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",