Extract diagonal terms from a variety of matrix types
diagonal(x, indices = NULL) # S3 method for default diagonal(x, indices = NULL)
x | A square matrix |
---|---|
indices | specifies a subset of the diagonal using a character vector of
names, a logical vector or integer indices. The default ( |
a named vector containing the diagonal elements.
Insists that input matrix is square. Uses the 'diagonal'
attribute when available and has specialised handling of ff
,
big.matrix
, dgCMatrix
matrices. Does not check that row and
column names are identical for those matrix classes (unlike the base
diag
function, but always uses rownames.
#> a b c d e #> 0 0 0 0 0