import(sp)
import(zoo)
import(xts)
import(methods)

exportClasses(
	xts, 
	ST, STF, STFDF, 
	STP, STPDF, 
	STS, STSDF, STSDFtraj, 
	ltraj)

export(ST, 
	STF, STFDF,
	STP, STPDF,
	STS, STSDF,
	as.data.frame.STF,
	as.data.frame.STP,
	as.data.frame.STS,
	as.data.frame.STFDF,
	as.data.frame.STPDF,
	as.data.frame.STSDF,
	unstack.STFDF,
	stplot)

S3method(as.data.frame, STF)
S3method(as.data.frame, STFDF)
S3method(as.data.frame, STPDF)
S3method(as.data.frame, STSDF)
S3method(index, STF)
S3method(index, STP)
S3method(index, STS)
S3method(index, STFDF)
S3method(index, STPDF)
S3method(index, STSDF)
S3method(dim, ST)
S3method(dim, STF)
S3method(dim, STP)
S3method(dim, STS)
S3method(dim, STFDF)
S3method(dim, STPDF)
S3method(dim, STSDF)
#S3method(unstack, STFDF)
S3method(print, summary.ST)
S3method(rbind, STSDFtraj)