unstack: write STFDF to table forms

In spacetime: Classes and Methods for Spatio-Temporal Data

write STFDF to table forms

Description

create table forms of STFDF objects

Usage

 
## S3 method for class 'STFDF'
unstack(x, form, which = 1, ...)
## S3 method for class 'STFDF'
as.data.frame(x, row.names, ...)

Arguments

x	object of class STFDF
form	formula; can be omitted
which	column name or number to have unstacked
row.names	row.names for the data.frame returned
...	arguments passed on to the functions unstack or as.data.frame

Value

unstack returns the data in wide format, with each row representing a spatial entity and each column a time; see unstack for details and default behaviour.

as.data.frame returns the data.frame in long format, where the coordinates of the spatial locations (or line starting coordinates, or polygon center points) and time stamps are recycled accordingly.

Examples

sp = cbind(x = c(0,0,1), y = c(0,1,1))
row.names(sp) = paste("point", 1:nrow(sp), sep="")
library(sp)
sp = SpatialPoints(sp)
library(xts)
time = xts(1:4, as.POSIXct("2010-08-05")+3600*(10:13))
m = c(10,20,30) # means for each of the 3 point locations
mydata = rnorm(length(sp)*length(time),mean=rep(m, 4))
IDs = paste("ID",1:length(mydata))
mydata = data.frame(values = signif(mydata,3), ID=IDs)
stfdf = STFDF(sp, time, mydata)
as.data.frame(stfdf, row.names = IDs)
unstack(stfdf)
t(unstack(stfdf))
unstack(stfdf, which = 2)

spacetime documentation built on April 6, 2023, 1:09 a.m.