[R] question on waveletcomp plot image

[Sudheer Joseph]

Dear R experts,
                         I have used waveletcomp package of R  and was
trying to get the dates formatted as month & year but get below error while
trying it with the example provided  in
http://www.hs-stat.com/projects/WaveletComp/WaveletComp_guided_tour.pdf
Kindly help me with the dateformat so that I can get %Y-%m as xaxis label
data(FXtrade.transactions)
my.data.a = FXtrade.transactions[FXtrade.transactions$active == T, ]
my.w.a = analyze.wavelet(
+     my.data.a, "transactions",
+     loess.span = 0.0, # no detrending required
+     dt = 1/(12*24),
+     # one day has 12*24 5-minute time slots
+     dj = 1/250,
+     # resolution along period axis
+     lowerPeriod = 1/8, # lowest period of interest: 3 hours
+     make.pval = T,
+     # draws white lines indicating significance
+     n.sim = 10)


wt.image(my.w.a, n.levels = 250, periodlab = "periods (days)",
+          legend.params = list(lab = "wavelet power levels"),
+          show.date = T, date.format = "%Y %m", timelab = "")
Error in plot.window(...) : need finite 'xlim' values
In addition: Warning messages:
1: In min(x) : no non-missing arguments to min; returning Inf
2: In max(x) : no non-missing arguments to max; returning -In
with best regards

Sudheer

**********************************************************************************
Dr. Sudheer Joseph

Scientist,

INCOIS, MoES, Govt. of India.
"OCEAN VALLEY" , Pragathi Nagar (BO), Nizampet SO,  Telangana, India. PIN-
500 090.
Tel:+91-9440832534(Mobile) Tel:+91-40-23886047(O),Fax:+91-40-23892910(O)
E-mail: sjo.India at gmail.com;  sjo at incois.gov.in.
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                        Martin Luther King, Jr.
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