Build Gram for same-class Laplacian using label factors.

Z^T L_s Z = Z^T D_s Z - (Z^T C)(Z^T C)^T

Usage

gram_Ls(Zop, F)

Arguments

Zop

Operator for kernel blocks.

F

Label factor list from `label_factors()`.

Value

Symmetric dense matrix of size r x r.

Examples

# \donttest{
library(Matrix)
K1 <- Matrix(rnorm(20), 10, 2)
Zop <- make_Zop_from_Ks(list(K1))
# F <- label_factors(...)  # Requires label factors
# G <- gram_Ls(Zop, F)
# }