Align grid with ticks


When I let <a href="https://stat.ethz.ch/R-manual/R-devel/library/graphics/html/plot.html" rel="nofollow">plot</a> draw the axis, <a href="https://stat.ethz.ch/R-manual/R-devel/library/graphics/html/grid.html" rel="nofollow">grid</a> aligns with ticks <a href="https://stackoverflow.com/q/8081931/850781" rel="nofollow">by default</a>.

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)

and I cannot get the grid to align with the ticks:

<a href="https://i.stack.imgur.com/Ytxbc.png" rel="nofollow"><img alt="grid and ticks do not align" class="b-lazy" data-src="https://i.stack.imgur.com/Ytxbc.png" data-original="https://i.stack.imgur.com/Ytxbc.png" src="https://etrip.eimg.top/images/2019/05/07/timg.gif" /></a>

How do I make them align?


Looks like <a href="https://stat.ethz.ch/R-manual/R-devel/library/graphics/html/abline.html" rel="nofollow">abline</a> 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")

<a href="https://i.stack.imgur.com/mQA1U.png" rel="nofollow"><img alt="enter image description here" class="b-lazy" data-src="https://i.stack.imgur.com/mQA1U.png" data-original="https://i.stack.imgur.com/mQA1U.png" src="https://etrip.eimg.top/images/2019/05/07/timg.gif" /></a>


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