Hello,
You cannot pass a vector of colors to col.axis, you need to plot the
axis twice, once the normal axis, like in your code, then overplot just
those last 2 labels.
xlabels <- seq(trunc(as.POSIXct(first_day, format="%Y-%m-%d-%H-%M"),
"days"), trunc(as.POSIXct(last_day, format="%Y-%m-%d-%H-%M"), "days"),
by="12 hours")
plot(df_plot$data_POSIX, df_plot$hs1, type="b",
xlim = c(min(xlabels), max(xlabels)), ylim=c(0, 10), col="blue",
xaxt="n", axes=F, main="", xlab="", ylab="Snow height")
lines(df_plot$data_POSIX, df_plot$hs2, ylim=c(0, 10), col="red", type="b")
axis.POSIXct(1, at = xlabels, format="h%H-%d-%m-%y", pos=0, las = 2)
axis.POSIXct(1, at = tail(xlabels, 2),
format="h%H-%d-%m-%y", pos=0, las = 2, col.axis = "red")
axis(side=2, at=seq(0, 15, 5))
Hope this helps,
Rui Barradas
Às 15:09 de 07/05/20, Stefano Sofia escreveu:
Dear R users,
in a plot I need to change the colours of some of the labels of the x-axis.
In the example below reported, I would like to have the labels of the last and
second-last date in red.
I tried to find the solution searching the web, but I could not understand the
hints and I was not sure I could adapt them to my example.
There might be an easy way to do that?
Thank you for your attention and your help
Stefano
first_day <- "2005-01-23-09-00"
last_day <- "2005-01-27-09-00"
first_day_POSIX <- as.POSIXct(first_day, format="%Y-%m-%d-%H-%M")
last_day_POSIX <- as.POSIXct(last_day, format="%Y-%m-%d-%H-%M")
df_plot <- data.frame(data_POSIX=seq(first_day_POSIX, last_day_POSIX, by="30
mins"))
df_plot$hs1 <- 5
df_plot$hs2 <- 7
plot(df_plot$data_POSIX, df_plot$hs1, type="b", ylim=c(0, 10), col="blue", xaxt="n", axes=F,
main="", xlab="", ylab="Snow height")
lines(df_plot$data_POSIX, df_plot$hs2, ylim=c(0, 10), col="red", type="b")
axis.POSIXct(1, at=seq(trunc(as.POSIXct(first_day, format="%Y-%m-%d-%H-%M"), "days"), trunc(as.POSIXct(last_day,
format="%Y-%m-%d-%H-%M"), "days"), by="12 hours"), format="h%H-%d-%m-%y", pos=0)
axis(side=2, at=seq(0, 15, 5))
(oo)
--oOO--( )--OOo----------------
Stefano Sofia PhD
Civil Protection - Marche Region
Meteo Section
Snow Section
Via del Colle Ameno 5
60126 Torrette di Ancona, Ancona
Uff: 071 806 7743
E-mail: stefano.so...@regione.marche.it
---Oo---------oO----------------
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