delta.tensor {tensorA} | R Documentation |
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))