[R] Problem adding lines to a plot, when y is defined

[Cech, Christian]

Dear all,

I want to create a line-plot with two lines and some additional scatter-plots.
However, adding a line to the plot does not work when I specify the y-argument in the plot command, while it does work when y is not specified.

I first send you an example that works:
plot(var[, 3],
     type="l",
     ylim=c(-0.04, 0),
     ylab   = 'portfolio returns',
     xlab   = 'time')
lines(var[, 5], type="l", lty=3)
for (i in 1:nrow(var)) {
  if(var[i, 4] | var[i,6])
    points(i, var[i, 2], pch=4)
}

--> the result is displayed in attachment "Plot1.pdf"

What does not work is the following code, where as the first argument of plot (ie the y-argument) is defined:
plot(as.Date(var[, 1], origin="1899-12-30"),
     var[, 3],
     type="l",
     ylim=c(-0.04, 0),
     ylab='portfolio returns',
     xlab='time')
lines(var[, 5], type="l", lty=3)
for (i in 1:nrow(var)) {
  if(var[i, 4] | var[i,6])
    points(i, var[i, 2], pch=4)
}

--> the result is displayed in attachment "Plot2.pdf"

The same problem appears if instead of

as.Date(var[, 1], origin="1899-12-30")

I use

var[, 1]

to define the y-argument.

I do very much appreciate your help!
Kind regards,
Christian Cech

________________________________


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