On 08/22/2013 09:04 AM, Prof J C Nash (U30A) wrote:
Thanks. The staxlab works with the plot generated by
plot(tt, data,....)
but not with
plot(tsdata, ...)
i.e., it seems to be the tsplot that somehow changes something and the
axis commands have no effect.
I probably should have pointed out that my main concern is that I'm not
getting any error msg. Just no axis label. And it seems I need to make
sure the labels vector is the same length as I need -- no recycling.
JN
Hi JN,
This is an interesting problem for me as it affords an opportunity to
learn about time series. I can hack a quick solution like this:
plotlim<-par("usr")
xlim<-c(plotlim[1]+(plotlim[2]-plotlim[1])*0.04,plotlim[2]-
(plotlim[2]-plotlim[1])*0.04)
xlim
[1] 2011.007 2013.243
nint<-length(yt)-1
labpos<-cumsum(c(xlim[1],rep(diff(xlim)/nint,nint)))
staxlab(1, at=labpos, label=months)
This works, but it is not a very elegant way to get the x positions of a
time series. It does allow one to calculate the x positions of any
equally spaced series of plotted values (using par("xaxt") to work out
the space at the edges).
The "ts" function seems to infer that a "start=c(2011,1),frequency=12"
time series refers to years and months, but assigns the x positions as
decimal years. I cannot find a way to extract the x positions from the
time series and could only offer a really ugly function that tried to
guess the intervals using the "start" and "frequency" arguments and then
calculated the x positions from these. However, I can see that this
would be a useful thing to have, so I'll think about it.
Jim
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