Displaying 2 results from an estimated 2 matches for "z_nonna".
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inonna
2012 Apr 05
2
random sample from list
...ot;),"/ex",sep=""),pattern="grd",full.names=TRUE)
mask <- raster(files[[9]])
#make point data
pts<-randomPoints(mask,100)
#extract the unique cell numbers within a 800km buffer of the points,
remove NA cells
z <- extract(mask, pts, buffer=800000,cellnumbers=T)
z_nonna <- lapply(z, na.omit)
###########PROBLEM AREA##########
##If I convert this to a dataframe and find the unique "cells" values
#z2<-as.data.frame(do.call(rbind,z_nonna))
#z_unique<-unique(z2[,1])
##I can tell there there are 9763 unique "cells" values
#How do I randomel...
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",