Description Usage Arguments Details Value Author(s) See Also Examples

A tensor can be seen as a linear mapping of a tensor to a tensor. This function gives the corresponding matrix of the mapping.

1 | ```
to.matrix.tensor(X,i,j,by=NULL)
``` |

`X` |
The tensor |

`i` |
The image indices of the linear mapping |

`j` |
The domain indices of the linear mapping |

`by` |
the operation is done in parallel for these dimensions |

A tensor can be seen as a linear mapping of a tensor to a tensor. This function computes the corresponding matrix, mapping the entries of the domain tensor to the entries of the image tensor.

if no `by`

is given a matrix. Otherwise a tensor of level
`2+length(dim(X))[by]`

giving matrices for each specification of the by dimensions.

K. Gerald van den Boogaart

`to.tensor`

, `solve.tensor`

,
`inv.tensor`

, `svd.tensor`

1 2 3 4 5 6 7 8 | ```
A <- reorder.tensor(to.tensor(1:30,c(a=2,b=3,c=5)),c("c","a","b"))
to.matrix.tensor(A,"a",c("b","c")) # matrix(1:30,nrow=2)
to.matrix.tensor(A,c("a","b"),c("c")) # matrix(1:30,nrow=6)
to.matrix.tensor(A,c("a","b"),by=c("c")) # structure(1:30,dim=c(6,1,5)))
to.matrix.tensor(A,c("a"),by=c("c")) # structure(1:30,dim=c(2,3,5)))
``` |

tensorA documentation built on May 30, 2017, 4:24 a.m.

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