Description Usage Arguments Details Value References See Also Examples

General folding of a matrix into a Tensor. This is designed to be the inverse function to `unfold-methods`

, with the same ordering of the indices. This amounts to following: if we were to unfold a Tensor using a set of `row_idx`

and `col_idx`

, then we can fold the resulting matrix back into the original Tensor using the same `row_idx`

and `col_idx`

.

1 |

`mat` |
matrix to be folded into a Tensor |

`row_idx` |
the indices of the modes that are mapped onto the row space |

`col_idx` |
the indices of the modes that are mapped onto the column space |

`modes` |
the modes of the output Tensor |

This function uses `aperm`

as the primary workhorse.

Tensor object with modes given by `modes`

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

`unfold-methods`

, `k_fold`

, `unmatvec`

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