R Graphical Manual

Last data update: 2014.03.03

R: Creates a Kronecker delta tensor

delta.tensor

R Documentation

Creates a Kronecker delta tensor

The delta tensor is the tensor equivalent of the identity.

delta.tensor(d,mark="'",dn=NULL,by=NULL)

`d`	the row dimensions
`mark`	a character to be concatenated to the names of the row dimensions to get the column dimension names
`dn`	dimnames for the result
`by`	the dimensions which should not be duplicated

E_{i_1...i_n j_1...j_n}=δ_{i_1j_1}...δ_{i_n j_n}

a tensor with dimension c(d,mark(d,mark))

K. Gerald van den Boogaart

delta.tensor(c(a=2,b=3))