Hallo,
i try to draw a plot (plot.zoo) with a secondary y-axis.
Further I want to draw reference lines.
Unfortunately I do not manage to get control on the ticks, so that the
reference lines match both- primary and secondary y-axis.

Maybe someone already solved this problem??

It would be great.
Bastian

Here is some code to ty out:

## R-Help 2014-05-27
## Test second. Y-Axix
library("zoo")

## generate some smooth timeseries
x1 <- c(38.2, 18.1, 83.2, 42.7, 22.8, 48.1, 81.8, 129.6, 52.0, 110.3)
x2 <- c(2.2, 0.8, 0.7, 1.6, 0.9, 0.9, 1.1, 2.8, 5.1, 2.1)

z1 <- zooreg(x1, start=as.POSIXct("2013-01-01 00:00:01"),
frequency=0.0000006)
z2 <- zooreg(x2, start=as.POSIXct("2013-01-01 00:00:20"),
frequency=0.0000006)
zt <- zooreg(rnorm(1050), start=as.POSIXct("2013-01-01 00:00:01"),
frequency=0.00007)

z<-merge(zt, z1, all = TRUE)
z<-merge(z, z2, all = TRUE)
Zf<-na.spline(z[,2:3], na.rm = FALSE)
##  ##  ##  ##


## Plot 1
plot(Zf$z1, ylim=c(0,signif(max(na.omit(Zf$z1)*1.05),2)), xlab="")
#grid(col = "lightgray", lty = "dotted") ## this plots at weird ticks
#abline(h=ablineticks, col = "lightgray", lty = "dotted") ## need to write
a vector for matching lines
## The following line of z1 doesn't match the first
opar <- par(usr = c(par("usr")[1:2],
c(0,signif(max(na.omit(Zf$z1)*1.05),2))))
axis(side = 4)
mtext(ylab2, side = 4, line = 3, cex=0.7)
lines(Zf$z1, lty=2)
par(opar)
##  ##  ##  ##

## nice would be a sekundary axis of a second zoo series with ticks
matching the first one
plot(Zf$z1, ylim=c(0,signif(max(na.omit(Zf$z1)*1.05),2)), xlab="")
#grid(col = "lightgray", lty = "dotted") ## this plots at weird ticks
#abline(h=ablineticks, col = "lightgray", lty = "dotted") ## need to write
a vector for matching lines
## The following line of z1 doesn't match the first
opar <- par(usr = c(par("usr")[1:2],
c(0,signif(max(na.omit(Zf$z2)*1.05),2))))
axis(side = 4)
mtext(ylab2, side = 4, line = 3, cex=0.7)
lines(Zf$z2, lty=2)
par(opar)
##  ##  ##  ##

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