Create Circulant Matrices

Creates a circulant matrix in spam format.

circulant.spam(x, n = NULL, eps = getOption("spam.eps"))

Arguments

x

the first row to form the circulant matrix or a list containing the indices and the nonzero values.

n

if x is a list, the dimension of the matrix.

eps

A tolerance parameter: elements of x such that abs(x) <= eps set to zero. Defaults to eps = getOption("spam.eps")

Value

The circulant matrix in spam format.

See also

circulant from package magic, toeplitz.spam

Author

Reinhard Furrer

Examples

circulant.spam(c(1,.25,0,0,0))
#>      [,1] [,2] [,3] [,4] [,5]
#> [1,] 1.00 0.25 0.00 0.00 0.00
#> [2,] 0.00 1.00 0.25 0.00 0.00
#> [3,] 0.00 0.00 1.00 0.25 0.00
#> [4,] 0.00 0.00 0.00 1.00 0.25
#> [5,] 0.25 0.00 0.00 0.00 1.00
#> Class 'spam' (32-bit)