R 使用plot.xts开发版本的自定义绘图功能

我正在构建一个自定义函数，可以自动将图例添加到plot.xts对象中

代码如下：

library(xts)
library(PerformanceAnalytics)
data(edhec)
R <- edhec[,1:4]
chartS <- function(R, 
                   y = NULL, 
                   multi.panel = FALSE, 
                   type = "l", 
                   yaxis.same = TRUE, 
                   event.lines = NULL, 
                   event.labels = NULL, 
                   event.col = 1,
                   event.offset = 1.2, 
                   event.pos = 2, 
                   event.srt = 90, 
                   event.cex = 1.5,
                   lty = 1,
                   lwd = 2,
                   legend.loc = NULL, 
                   legend.names = NULL, ...) {

  plot.xts(R, y = y, multi.panel = multi.panel, 
           type = type, yaxis.same = yaxis.same, lty = lty, lwd = lwd, ...)

  plot_object <- xts:::current.xts_chob()

  columns <- plot_object$Env$xdata
  columnnames <- plot_object$Env$column_names

  if(!is.null(event.lines)) {
    # error occurred
    addEventLines(xts(event.labels, as.Date(event.lines)), 
                  offset = event.offset, pos = event.pos, 
                  srt = event.srt, cex = event.cex, col = event.col, ...)
  }

  if(is.null(legend.loc))
    legend.loc <- "topright"  
  if(is.null(legend.names))
    legend.names <- columnnames

  if(!multi.panel)
    addLegend(legend.loc, legend.names, lty = lty, lwd = lwd, ...)
}


# chartS(R)
# chartS(R, lty = 1:4)
chartS(R, multi.panel = TRUE)

将代码移到绘图.xts上方

library(xts)
library(PerformanceAnalytics)
data(edhec)
R <- edhec[,1:4]
chartS <- function(R, 
                   y = NULL, 
                   multi.panel = FALSE, 
                   type = "l", 
                   yaxis.same = TRUE, 
                   event.lines = NULL, 
                   event.labels = NULL, 
                   event.col = 1,
                   event.offset = 1.2, 
                   event.pos = 2, 
                   event.srt = 90, 
                   event.cex = 1.5,
                   lty = 1,
                   lwd = 2,
                   legend.loc = NULL, 
                   legend.names = NULL, ...) {

  plot.xts(R, y = y, multi.panel = multi.panel, 
           type = type, yaxis.same = yaxis.same, lty = lty, lwd = lwd, ...)


}


# chartS(R)
# chartS(R, lty = 1:4)
chartS(R, multi.panel = TRUE)

library(xts)
library(PerformanceAnalytics)
data(edhec)
R <- edhec[,1:4]
chartS <- function(R, 
                   y = NULL, 
                   multi.panel = FALSE, 
                   type = "l", 
                   yaxis.same = TRUE, 
                   event.lines = NULL, 
                   event.labels = NULL, 
                   event.col = 1,
                   event.offset = 1.2, 
                   event.pos = 2, 
                   event.srt = 90, 
                   event.cex = 1.5,
                   lty = 1,
                   lwd = 2,
                   legend.loc = NULL, 
                   legend.names = NULL, ...) {


  columns <- ncol(R)
  columnnames <- colnames(R)

  if(!is.null(event.lines)) {
    # error occurred
    addEventLines(xts(event.labels, as.Date(event.lines)), 
                  offset = event.offset, pos = event.pos, 
                  srt = event.srt, cex = event.cex, col = event.col, ...)
  }

  if(is.null(legend.loc))
    legend.loc <- "topright"  
  if(is.null(legend.names))
    legend.names <- columnnames

  if(!multi.panel)
    addLegend(legend.loc, legend.names, lty = lty, lwd = lwd, ...)

  plot.xts(R, y = y, multi.panel = multi.panel, 
           type = type, yaxis.same = yaxis.same, lty = lty, lwd = lwd, ...)
}


# chartS(R)
# chartS(R, lty = 1:4)
chartS(R, multi.panel = TRUE)

库（xts）
库（性能分析）
数据（edhec）
R您需要跟踪正在构建的绘图对象，并将其返回以便自动打印。您也不应该访问未报告的对象（
xts:：：current.xts_chob（）
），因为无法保证它们在不同版本之间保持一致

chartS <-
function(R, y = NULL, multi.panel = FALSE, type = "l", yaxis.same = TRUE, 
         event.lines = NULL, event.labels = NULL, event.col = 1,
         event.offset = 1.2, event.pos = 2, event.srt = 90, event.cex = 1.5,
         lty = 1, lwd = 2, legend.loc = NULL, legend.names = NULL, ...)
{
  plot_object <- plot.xts(R, y = y, multi.panel = multi.panel, type = type,
    yaxis.same = yaxis.same, lty = lty, lwd = lwd, ...)

  columns <- plot_object$Env$xdata
  columnnames <- plot_object$Env$column_names

  if(!is.null(event.lines)) {
    plot_object <-
      addEventLines(xts(event.labels, as.Date(event.lines)), offset = event.offset,
        pos = event.pos, srt = event.srt, cex = event.cex, col = event.col, ...)
  }

  if(is.null(legend.loc))
    legend.loc <- "topright"  
  if(is.null(legend.names))
    legend.names <- columnnames

  if(!multi.panel)
    plot_object <- addLegend(legend.loc, legend.names, lty = lty, lwd = lwd, ...)

  return(plot_object)
}

chartS您需要跟踪正在构建的绘图对象，并将其返回以便自动打印。您也不应该访问未报告的对象（
xts:：：current.xts_chob（）
），因为无法保证它们在不同版本之间保持一致

chartS <-
function(R, y = NULL, multi.panel = FALSE, type = "l", yaxis.same = TRUE, 
         event.lines = NULL, event.labels = NULL, event.col = 1,
         event.offset = 1.2, event.pos = 2, event.srt = 90, event.cex = 1.5,
         lty = 1, lwd = 2, legend.loc = NULL, legend.names = NULL, ...)
{
  plot_object <- plot.xts(R, y = y, multi.panel = multi.panel, type = type,
    yaxis.same = yaxis.same, lty = lty, lwd = lwd, ...)

  columns <- plot_object$Env$xdata
  columnnames <- plot_object$Env$column_names

  if(!is.null(event.lines)) {
    plot_object <-
      addEventLines(xts(event.labels, as.Date(event.lines)), offset = event.offset,
        pos = event.pos, srt = event.srt, cex = event.cex, col = event.col, ...)
  }

  if(is.null(legend.loc))
    legend.loc <- "topright"  
  if(is.null(legend.names))
    legend.names <- columnnames

  if(!multi.panel)
    plot_object <- addLegend(legend.loc, legend.names, lty = lty, lwd = lwd, ...)

  return(plot_object)
}

chartS提供
xts
version，我记得我在不久前的devel版本中看到了
plot.xts
大量更改/重写（？）。它来自Github上的joshuaulrich/xts。提供
xts
version，我记得我见过
plot.xts
大量更改/重写（？）在不久前的devel版本中。它来自Github上的joshuaulrich/xts。谢谢Joshua。现在对我来说很好。新版本非常好：）谢谢约书亚。现在对我来说很好。新版本非常好：）