margin: Marginalization of tensors
| margin.tensor | R Documentation |
Marginalization of tensors
Description
The function removes dimensions from a tensor by summing all entries which only differ in these dimensions.
Usage
margin.tensor(X,i=NULL,by=NULL)
Arguments
X |
the tensor |
i |
the dimensions to be removed |
by |
instead of i the dimensions to be kept |
Details
This is a tensor multiplication with the 1_i tensor.
Value
The tensor with all elements only differing only in the dimensions specified added up and only the other dimensions left over.
Author(s)
K. Gerald van den Boogaart
See Also
to.tensor
Examples
A <- diag(1:5)
A
margin.tensor(A,1)
A <- to.tensor(1:30,dim=c(i=3,j=5,k=2))
ftable(A)
margin.tensor(A,"j")
