hist.panel = function (x, ...=NULL ) { par(new = TRUE) hist(x, col = "#D8EAF6", probability = TRUE, axes = FALSE, main = "", breaks = "FD", xlab = "Variable Name", ylab = "Count") #col = "light gray", breaks = "FD"绘制对角线柱状图底部x分布图 lines(density(x, na.rm=TRUE), col = "red", lwd = 1) #lines(f, col="blue", lwd=1, lty=1) how to add gaussian normal overlay? rug(x) }每个格子只要左边、下边的坐标轴，不要右边和上边的坐标轴，并且将左边及下边的坐标轴颜色改为浅灰色，求代码，谢谢

你可以使用`axis()`函数来控制坐标轴的显示。具体来说，`side`参数控制坐标轴的位置，`col.axis`参数控制坐标轴的颜色。下面是修改后的代码：

hist.panel = function (x, ...=NULL ) {         
  par(new = TRUE)         
  hist(x,              
    col = "#D8EAF6",              
    probability = TRUE,              
    axes = FALSE,              
    main = "",              
    breaks = "FD", 
    xlab = "Variable Name",          
    ylab = "Count") 
  #col = "light gray", breaks = "FD"
  # 绘制对角线柱状图底部x分布图         
  lines(density(x, na.rm=TRUE), col = "red", lwd = 1)          
  #lines(f, col="blue", lwd=1, lty=1) how to add gaussian normal overlay?         
  rug(x)
  
  # 只显示左边和下边的坐标轴
  axis(side = 1, col.axis = "lightgray")
  axis(side = 2, col.axis = "lightgray")
}