index | R Documentation |
Functions to get or set the names of the dimensions of an array
.
index(x)
index(x) <- value
x |
|
value |
vector of indices. |
Vector of indices.
index(x) <- value
: set indices.
Guidotti E (2022). "calculus: High-Dimensional Numerical and Symbolic Calculus in R." Journal of Statistical Software, 104(5), 1-37. \Sexpr[results=rd]{tools:::Rd_expr_doi("10.18637/jss.v104.i05")}
Other tensor algebra:
contraction()
,
delta()
,
diagonal()
,
einstein()
,
epsilon()
### array with no indices
x <- array(1, dim = c(1, 3, 2))
index(x)
### indices on initialization
x <- array(1, dim = c(i=1, j=3, k=2))
index(x)
### set indices on the fly
x <- array(1, dim = c(1, 3, 2))
index(x) <- c("i", "j", "k")
index(x)
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