rTensor (version 1.4)

unmatvec: Unmatvec Folding of Matrix

Description

The inverse operation to matvec-methods, turning a matrix into a Tensor. For a full account of matrix folding/unfolding operations, consult Kolda and Bader (2009).

Usage

unmatvec(mat, modes = NULL)

Arguments

mat

matrix to be folded into a Tensor

modes

the modes of the output Tensor

Value

Tensor object with modes given by modes

References

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

See Also

matvec-methods, fold, k_fold

Examples

# NOT RUN {
tnsr <- new("Tensor",3L,c(3L,4L,5L),data=runif(60))
matT1<-matvec(tnsr)
identical(unmatvec(matT1,modes=c(3,4,5)),tnsr)
# }