我正在使用程序包中的函数。这个函数返回一些值。例如:是否有可能看到函数的值的源代码
k<-dtw(v1,v2, keep.internals=TRUE)
,我可以得到这个值:
k$costMatrix
是否可以看到的costMatrix
的源代码?如果是的话我该怎么做?
UPDATE 这是函数的源代码:
function (x, y = NULL, dist.method = "Euclidean", step.pattern = symmetric2,
window.type = "none", keep.internals = FALSE, distance.only = FALSE,
open.end = FALSE, open.begin = FALSE, ...)
{
lm <- NULL
if (is.null(y)) {
if (!is.matrix(x))
stop("Single argument requires a global cost matrix")
lm <- x
}
else if (is.character(dist.method)) {
x <- as.matrix(x)
y <- as.matrix(y)
lm <- proxy::dist(x, y, method = dist.method)
}
else if (is.function(dist.method)) {
stop("Unimplemented")
}
else {
stop("dist.method should be a character method supported by proxy::dist()")
}
wfun <- .canonicalizeWindowFunction(window.type)
dir <- step.pattern
norm <- attr(dir, "norm")
if (!is.null(list(...)$partial)) {
warning("Argument `partial' is obsolete. Use `open.end' instead")
open.end <- TRUE
}
n <- nrow(lm)
m <- ncol(lm)
if (open.begin) {
if (is.na(norm) || norm != "N") {
stop("Open-begin requires step patterns with 'N' normalization (e.g. asymmetric, or R-J types (c)). See papers in citation().")
}
lm <- rbind(0, lm)
np <- n + 1
precm <- matrix(NA, nrow = np, ncol = m)
precm[1, ] <- 0
}
else {
precm <- NULL
np <- n
}
gcm <- globalCostMatrix(lm, step.matrix = dir, window.function = wfun,
seed = precm, ...)
gcm$N <- n
gcm$M <- m
gcm$call <- match.call()
gcm$openEnd <- open.end
gcm$openBegin <- open.begin
gcm$windowFunction <- wfun
lastcol <- gcm$costMatrix[np, ]
if (is.na(norm)) {
}
else if (norm == "N+M") {
lastcol <- lastcol/(n + (1:m))
}
else if (norm == "N") {
lastcol <- lastcol/n
}
else if (norm == "M") {
lastcol <- lastcol/(1:m)
}
gcm$jmin <- m
if (open.end) {
if (is.na(norm)) {
stop("Open-end alignments require normalizable step patterns")
}
gcm$jmin <- which.min(lastcol)
}
gcm$distance <- gcm$costMatrix[np, gcm$jmin]
if (is.na(gcm$distance)) {
stop("No warping path exists that is allowed by costraints")
}
if (!is.na(norm)) {
gcm$normalizedDistance <- lastcol[gcm$jmin]
}
else {
gcm$normalizedDistance <- NA
}
if (!distance.only) {
mapping <- backtrack(gcm)
gcm <- c(gcm, mapping)
}
if (open.begin) {
gcm$index1 <- gcm$index1[-1] - 1
gcm$index2 <- gcm$index2[-1]
lm <- lm[-1, ]
gcm$costMatrix <- gcm$costMatrix[-1, ]
gcm$directionMatrix <- gcm$directionMatrix[-1, ]
}
if (!keep.internals) {
gcm$costMatrix <- NULL
gcm$directionMatrix <- NULL
}
else {
gcm$localCostMatrix <- lm
if (!is.null(y)) {
gcm$query <- x
gcm$reference <- y
}
}
class(gcm) <- "dtw"
return(gcm)
}
,但如果我写globalCostMatrix
我不明白这个功能
我认为'#here some code'会告诉你它是如何为globalCostMatrix创建数据,然后是这个'costMatrix'。你不能直接访问'globalCostMatrix',因为它被封装在其他函数定义中。 – Llopis
我已经复制完整的代码。我不能在这个函数中看到'globalCostMatrix'的实现 – Kaja
你可以到CRAN的网站找到'dtw'包,找到函数的定义,下载源tar文件夹并转到'/ R'文件夹中的'globalCostMatrix.R'文件。你在R中没有看到这个函数,因为它没有被导出到'NAMESPACE'文件中。 –