Displaying 3 results from an estimated 3 matches for "randompoints".
2013 Apr 13
1
how can I convert a result (text) in table format in R?
Hi R user,
Could you please give me some hints on how I can convert text in table format in R?
I was doing model assessment using dismo package
for example:
bg <- randomPoints(current, 500)
pvtest <- data.frame(extract(current, occtest))
avtest <- data.frame(extract(current, bg))
e2 = evaluate(model, p=pvtest, a=avtest)
> e2
class : ModelEvaluation
n presences : 10
n absences : 1000
AUC : 0.9952
cor : 0.6453986
max TPR+...
2012 Apr 05
2
random sample from list
...rm(list = ls())
#load libraries
library(dismo)
library(raster)
##example data
#load map of land
files<-list.files(path=paste(system.file(package="dismo"),"/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...
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",