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#' Two-sample E-Test of Equal Distributions using Energy Statistics
#'
#' @keywords internal
#' @noRd
rtest2.energy <- function(input1, input2, mc.iter=1234){
#-------------------------------------------------------
# must be of 'riemdata' class
if ((class(input1))!="riemdata"){
stop("* rtest2.energy : the 'input1' must be of 'riemdata' class. Use 'riemfactory' first to manage your data.")
}
if ((class(input2))!="riemdata"){
stop("* rtest2.energy : the 'input2' must be of 'riemdata' class. Use 'riemfactory' first to manage your data.")
}
# acquire manifold name
mfdname = tolower(input1$name)
# get data size
m = length(input1$data) # for class 1
n = length(input2$data) # for class 2
#-------------------------------------------------------
## Prepare for using 'ENERGY' package
# stack two datasets into one datacube
dcube = rclust_stack3d2(input1, input2)
# compute distance
dcdist = rclust_pdist_cube(dcube, mfdname, type="extrinsic")
#-------------------------------------------------------
## Run the test
output = eqdist.etest(dcdist, distance=TRUE, sizes=c(m,n), R=mc.iter)
return(output)
}
# Example with rvmf
# library(RiemBase)
# library(Directional)
# x = riemfactory(t(rvmf(100, c(1,0,0), 5)), name="sphere")
# y = riemfactory(t(rvmf(50, c(1,0,0), 5)), name="sphere")
# dxy = rtest2.energy(x, y, mc.iter = 100)
# dxy
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