rTensor: k_fold – R documentation

Become an expert in R — Interactive courses, Cheat Sheets, certificates and more!

k_fold

k-mode Folding of Matrix

Description

k-mode folding of a matrix into a Tensor. This is the inverse funtion to k_unfold in the m mode. In particular, k_fold(k_unfold(tnsr, m),m,getModes(tnsr)) will result in the original Tensor.

Usage

k_fold(mat, m = NULL, modes = NULL)

Arguments

`mat`	matrix to be folded into a Tensor
`m`	the index of the mode that is mapped onto the row indices
`modes`	the modes of the output Tensor

Details

This is a wrapper function to fold.

Value

Tensor object with modes given by modes

References

T. Kolda, B. Bader, "Tensor decomposition and applications". SIAM Applied Mathematics and Applications 2009.

Examples

tnsr <- new("Tensor",3L,c(3L,4L,5L),data=runif(60))
matT2<-k_unfold(tnsr,m=2)
identical(k_fold(matT2,m=2,modes=c(3,4,5)),tnsr)

rTensor

Tools for Tensor Analysis and Decomposition

v1.4.8

GPL (>= 2)

Authors

James Li and Jacob Bien and Martin Wells

Initial release

2021-05-14