KernelMatern {BKTR}

R6 class for Matern Kernels

Description

R6 class for Matern Kernels

Super class

BKTR::Kernel -> KernelMatern

Public fields

lengthscale

The lengthscale parameter instance of the kernel

smoothness_factor

The smoothness factor of the kernel

has_dist_matrix

Identify if the kernel has a distance matrix or not

Methods

Public methods

• KernelMatern$new()

• KernelMatern$get_smoothness_kernel_fn()

• KernelMatern$core_kernel_fn()

• KernelMatern$clone()

Inherited methods

• BKTR::Kernel$add_jitter_to_kernel()
• BKTR::Kernel$kernel_gen()
• BKTR::Kernel$plot()
• BKTR::Kernel$set_positions()

Method new()

Create a new KernelMatern object.

Usage

KernelMatern$new(
  smoothness_factor = 5,
  lengthscale = KernelParameter$new(2),
  kernel_variance = 1,
  jitter_value = NULL
)

Arguments

smoothness_factor

Numeric: The smoothness factor of the kernel (1, 3 or 5)

lengthscale

KernelParameter: The lengthscale parameter instance of the kernel

kernel_variance

Numeric: The variance of the kernel

jitter_value

Numeric: The jitter value to add to the kernel matrix

Method get_smoothness_kernel_fn()

Method to the get the smoothness kernel function for a given integer smoothness factor

Usage

KernelMatern$get_smoothness_kernel_fn()

Returns

The smoothness kernel function

Method core_kernel_fn()

Method to compute the core kernel's covariance matrix

Usage

KernelMatern$core_kernel_fn()

Returns

The core kernel's covariance matrix

Method clone()

The objects of this class are cloneable with this method.

Usage

KernelMatern$clone(deep = FALSE)

Arguments

deep

Whether to make a deep clone.

Examples

# Create a new Matern 3/2 kernel
k_matern <- KernelMatern$new(smoothness_factor = 3)
# Set the kernel's positions
positions_df <- data.frame(x=c(-4, 0, 3), y=c(-2, 0, 2))
k_matern$set_positions(positions_df)
# Generate the kernel's covariance matrix
k_matern$kernel_gen()