R Under development (unstable) (2023-12-02 r85657 ucrt) -- "Unsuffered Consequences"
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Platform: x86_64-w64-mingw32/x64

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> suppressPackageStartupMessages(library(sp))
> suppressPackageStartupMessages(library(spacetime))
> 
> m = 3# nr of trajectories
> n = 100 # length of each
> l = vector("list", m)
> t0 = as.POSIXct("2013-05-05",tz="GMT")
> set.seed(1331)
> for (i in 1:m) {
+     x = cumsum(rnorm(n))
+     y = cumsum(rnorm(n))
+     sp = SpatialPoints(cbind(x,y))
+     #t = t0 + (0:(n-1) + (i-1)*n) * 60
+     t = t0 + (0:(n-1) + (i-1)*n/2) * 60
+     l[[i]] = STI(sp, t)
+ }
> stt= STT(l)
> sttdf = STTDF(stt, data.frame(attr = rnorm(n*m), id = paste("ID", rep(1:m, each=n))))
> x = as(stt, "STI")
> stplot(sttdf, col=1:m, scales=list(draw=TRUE))
> stplot(sttdf, by = "id")
> stplot(sttdf[1])
> stplot(sttdf[1])
> 
> p = Polygon(cbind(x=c(-20,-15,-15,-20,-20),y=c(10,10,15,15,10)))
> pol=SpatialPolygons(list(Polygons(list(p), "ID")))
> #if (require(rgeos, quietly = TRUE)) {
> #  stplot(sttdf[pol])
> #  names(sttdf[pol]@traj)
> #  stplot(sttdf[1:2],col=1:2)
> #  stplot(sttdf[,t0])
> #  stplot(sttdf[,"2013"])
> #  stplot(sttdf[pol,"2013"])
> #  is.null(sttdf[pol,t0])
> #}
> 
> proc.time()
   user  system elapsed 
   1.10    0.14    1.23