ggplot2 - time series in R -

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here question:
have these data

 summary(data)     date                    1990/01:  1                  1990/02:  1                 1990/03:  1                  1990/04:  1                 1990/05:  1                 1990/06:  1                 (other):242                   attribute  min.   :164.9    1st qu.:201.5    median :244.1    mean   :274.6    3rd qu.:313.3    max.   :512.1    na's   :  1.0

and want draw time series plot

so tried this:

qplot(as.date(date, "%y/%m/%d"), attribute, data = data, geom = "line", main="attribute per month 1990-2010", xlab="month-year", ylab="attribute" , colour = i("steelblue4"),fill = i("steelblue4"))

and got:
error in seq.int(r1$year, to$year, by) : 'from' must finite
in addition: warning messages:
1: in min(x) : no non-missing arguments min; returning inf
2: in max(x) : no non-missing arguments max; returning -inf

any ideas solve it?

thank you

this conversion as.date(date, "%y/%m/%d") gives na values.

try as.date(paste(date,"01",sep="/"), "%y/%m/%d").


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