diagonal {calculus} | R Documentation |
Functions to extract or replace the diagonals of an array
, or construct a diagonal array
.
diagonal(x = 1, dim = rep(2, 2)) diagonal(x) <- value
x |
an |
dim |
the dimensions of the (square) |
value |
vector giving the values of the diagonal entries. |
Vector of the diagonal entries of x
if x
is an array
.
If x
is a vector, returns the diagonal array
with the
entries given by x
.
diagonal<-
: set diagonals.
Guidotti, E. (2020). "calculus: High dimensional numerical and symbolic calculus in R". https://arxiv.org/abs/2101.00086
Other tensor algebra:
contraction()
,
delta()
,
einstein()
,
epsilon()
,
index()
### 3x3 matrix diagonal(x = 1, dim = c(3,3)) ### 2x2x2 array diagonal(x = 1:2, dim = c(2,2,2)) ### extract diagonals x <- diagonal(1:5, dim = c(5,5,5)) diagonal(x) ### set diagonals x <- array(0, dim = c(2,2,2)) diagonal(x) <- 1:2 x