2008/5/27 Prof Brian Ripley <[EMAIL PROTECTED]>:
> That is the part that needs justification. I've never seen an example where
> that was the case (and you don't give one), and I use acf() a lot. The
> examples fit and their series names are not particularly short.
>
> Also, the user has the option to supply 'main' to plot.acf via '...', so why
> is that not sufficient? And you can even suppress the title by main="" and
> use title() for even more control.
>
Here is an example with real-life series names and plot dimensions:
data <- cbind('Число пожаров' = arima.sim(n = 100, list(ar = 0.5)),
'Инд. Нестерова' = arima.sim(n = 100, list(ar = 0.1)))
x11(width = 4.8, height = 4.2)
acf(data, mar = c(3, 3, 3, 1) + 0.1, cex.main = 1)
I have tried to supply main argument to the acf function:
acf(data, mar = c(3, 3, 3, 1) + 0.1, cex.main = 1,
main = matrix(c('Число пожаров',
'Число пожаров &\nИнд. Нестерова',
'Число пожаров &\nИнд. Нестерова',
'Инд. Нестерова'), 2, 2))
but it doesn't work the desired way. Please see the implementation of
plot.acf. title function doesn't seem to play well with par(mfrow = ),
so it doesn't help, too.
In principle, it's not *that* hard to implement a custom version of
multivariate acf plot, but the current version of plot.acf provides
some sweet features like y-axes alignment etc. Writing another
plot.acf will inevitably lead to massive code duplication, which is
bad.
I have several ideas of how to tweak current plot.acf so it would
suffice my needs:
1) Add new main.sep argument (see the patch).
2) Let plot.acf recognize if main is a matrix and use its elements for
different plots, not just coerce it to vector and pass to every title.
3) Let plot.acf recognize if main is a function and call it with 2
arguments (i-series name and j-series name) to compose captions.
1) seems to be the easiest for a user, 2) and 3) provide more freedom.
Andrey Paramonov
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