使刻度线与网格对齐 [英] Align grid with ticks

问题描述

当我让 plot 绘制轴， grid 默认与ticks 对齐.

但是，我的情节有些牵连:

However, my plot is somewhat involved:

mytime <- as.POSIXct("2015-08-20") + seq(0,by=3600,length.out=7*24)
plot(x=mytime,y=rnorm(7*24),xaxt="n")
ticks <- mytime[seq(1,by=12,to=length(mytime))]
axis(1, ticks, strftime(ticks, "%a %H:%M"))
grid(ny=NULL,nx=14)

并且我无法使grid与ticks对齐:

如何使它们对齐?

推荐答案

类似于

Looks like abline is the answer:

mytime <- as.POSIXct("2015-08-20") + seq(0,by=3600,length.out=7*24)
plot(x=mytime,y=rnorm(7*24),xaxt="n")
ticks <- c(mytime[seq(1,by=12,to=length(mytime))],mytime[1]+7*24*3600)
axis(1, ticks, strftime(ticks, "%a %H:%M"))
grid(ny=NULL,nx=NA)
abline(v=ticks[seq(1,length(ticks),2)],lty="dotted",col="lightgray")

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