\name{kernel-class}\docType{class}\alias{rbfkernel-class}\alias{polykernel-class}\alias{vanillakernel-class}\alias{tanhkernel-class}\alias{kernel-class}\alias{kpar,kernel-method}\title{Class "kernel" "rbfkernel" "polykernel", "tanhkernel", "vanillakernel"}\description{  The build in \code{kernel} classes in \code{kernelab}}\section{Objects from the Class}{Objects can be created by calls of the form \code{new("rbfkernel", ...)},\code{new{"polykernel"}}, \code{new{"tanhkernel"}},\code{new{"vanillakernel"}}or by calling the \code{rbfdot}, \code{polydot}, \code{tanhdot},\code{vanilladot} functions.}\section{Slots}{  \describe{    \item{\code{.Data}:}{Object of class \code{"function"} containing      the kernel function }    \item{\code{kpar}:}{Object of class \code{"list"} containing the      kernel parameters }  }}\section{Extends}{Class \code{"kernel"}, directly.Class \code{"function"}, by class \code{"kernel"}.}\section{Methods}{  \describe{    \item{kernelMatrix}{\code{signature(kernel = "rbfkernel", x =	"matrix")}: computes the kernel matrix }    \item{kernelMult}{\code{signature(kernel = "rbfkernel", x =	"matrix")}: computes the quadratic kernel expression}    \item{kernelPol}{\code{signature(kernel = "rbfkernel", x =	"matrix")}: computes the kernel expansion }  }}\author{Alexandros Karatzoglou\cr \email{alexandros.karatzoglou@ci.tuwien.ac.at} }\seealso{  \code{\link{dots}}  }\examples{rbfkernel <- rbfdot(sigma = 0.1)rbfkernelis(rbfkernel)kpar(rbfkernel)}\keyword{classes}