[R] questions about plot.zoo

From: tom soyer <tom.soyer_at_gmail.com>
Date: Wed, 26 Dec 2007 21:55:28 -0600


Hi,

I have been having very good results using plot.zoo to chart time series data. But I have three questions about plot.zoo and I am wondering if anyone knows the answers.

(1) when I tried to use semi-log scale, via log="y", R issued a warning,
although it looked like plot.zoo plotted in semi-log scale anyway:

Warning message:
In plot.xy(xy.coords(x, y), type = type, ...) :   "log" is not a graphical parameter
Does anyone know if I should ignore the warning, or discard the semi-log looking graph instead?

(2) I noticed that plot.zoo automatically generates major tick marks for the
user. But does anyone know how to customize the major tick marks on the y-axis, and adding minor tick marks between them? I tried both axis() and minor.tick in the Hmisc package, but could not make them work. It seems that
axis() and minor.tick do not work well with dates.

(3) I tried to add horizontal grid like this:

x=axis(4)
abline(h=x,col="light gray")

It works... but unfortunately, the grid lines are all drawn on top, or in front, of the lines or bars of data on the chart. As a result, the grid lines cover up the lines of data when they cross each other. Does anyone know if it is possible to specify the order of lines on a chart, i.e., something like the z-index, so that the grid lines are behind the data lines? If not, then what would be the proper way of adding gridlines so that thay are consistent with the major and minor tick marks?

Thanks!

-- 
Tom

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Received on Thu 27 Dec 2007 - 03:59:41 GMT

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