[R] Secondary Y axis title

[John Theal]

Excellent.  Thank you both for the help.  Just what I was looking for.




On 21-Oct-07, at 12:18 AM, Dave Hewitt wrote:

> The controls for the margin sizes, which set the amount of space  
> allocated for the labels, are the 'mai' numbers in the first 'par'  
> call. The fourth number changed to 0.9 or greater should give you  
> more room like you're looking for.
>
> You can use the alternative 'mtext' way of adding the label (it's  
> simpler), which I have used below to make the right label appear  
> the same distance from the axis as the left label (option "line =  
> 3"). I don't see how to adjust the reading direction of the label  
> to be top-to-bottom with 'mtext', so I guess you'll need the 'text'  
> way of doing it if you want that orientation (although I don't  
> understand the 'usr' positions that define the location).
>
> Gabor, do you know how to change the reading direction with  
> 'mtext'? I tried 'srt' and that did not work.
>
>
> library(zoo)
>
> set.seed(1)
> z <- zoo(cbind(A = cumsum(rnorm(100)), B = cumsum(rnorm(100, mean =  
> 0.2))))
>
> par(mai = c(.8, .8, .2, .9))  # Or change '.9' to a larger number  
> for even more room (the units are inches)
>
> plot(z[,1], type = "l", xlab = "X axis label", ylab = colnames(z) 
> [1], lty = 1, lwd = 2)
>
> par(new = TRUE)
>
> plot(z[,2], type = "l", ann = FALSE, yaxt = "n", col = "blue", lty  
> = 2, lwd = 2)
>
> axis(4)
>
> legend(x = "topleft",  bty = "n",  lty = c(1,2),  lwd = c(2,2),
>        col = c("black", "blue"),  legend = paste(colnames(z), c 
> ("(left y-axis)", "(right y-axis)")))
>
> mtext(colnames(z)[2], 4, line = 3, col = "blue")
>
> --Dave
>
> At 11:42 PM 10/20/2007 +0200, John Theal wrote:
>> I still haven't resolved this problem.  However, when I run the  
>> plot.zoo example the label appears, it also appears if I enter the  
>> commands manually.  The problem that persists is that the label  
>> has to lie so close to the secondary y axis, that (in my case) it  
>> becomes almost indistinguishable from the axis scale labels.  If  
>> the label is long, then it over-writes some of the scale  
>> labeling.  I thought it might be do to the way the Quartz window  
>> manager handles the figure margins (under Mac OS X), but it looks  
>> as though maybe this is not the case.
>>
>> I'm running the same versions of R (2.6.0, unpatched) and zoo  
>> (1.4-0) as Gabor.  I am using R under Mac OS X.
>> Dave Hewitt wrote:
>>> I was curious about the exact same question that John Theal posed  
>>> - how to get a second y-axis label for a plot of two data series  
>>> against a common x (in my case, time).
>>>
>>> I tried two different methods - one in lattice and one in plot.  
>>> Both times the y-axis on the right side appears but the label  
>>> does not. Similar to John's comment, it appears that there is not  
>>> enough room for the label.
>>>
>>> Gabor mentioned that the plot.zoo examples give a plot like this.  
>>> When I run that series of examples, #7 appears to be what Gabor  
>>> was referring to, but even there the label for the right-hand y- 
>>> axis is missing.
>>>
>>> Help?
>>>
>>> Dave Hewitt
>
>