[R] Time series axis breaks

Felipe Carrillo
2017-06-07T20:48:24Z

I hope this is the appropriate list for this type of question
Consider the dataset below:I have a column DOC with values from 3 to 101and
those are the values that I want to show on my x axis, howeverI only get 3, 3.1,
3.2 and so on. I tried to change those values with xlim(3, 101) but I getthe
following error:Error in unit(x, default.units) : 'x' and
'units' must have length > 0
question: Which argument is needed in the ts() call to make the x axis
showbreaks every 7 days starting with 3?
wt <- structure(list(DOC = c(3, 10, 17, 24, 31, 38, 45, 52, 59, 66,?73, 80,
87, 94, 101), AvgWeight = c(1, 1.66666666666667, 2.06666666666667,?2.275,
3.83333333333333, 6.2, 7.4, 8.5, 10.25, 11.1, 13.625,?15.2, 16.375, 17.8, 21.5),
PondName = structure(c(1L, 1L, 1L,?1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L,
1L), .Label = "Pond01", class = "factor"),?? ? SampleDate =
structure(c(1182585600, 1183190400, 1183795200,?? ? 1184400000, 1185004800,
1185609600, 1186214400, 1186819200,?? ? 1187424000, 1188028800, 1188633600,
1189238400, 1189843200,?? ? 1190448000, 1191052800), class =
c("POSIXct", "POSIXt"))), .Names =
c("DOC",?"AvgWeight", "PondName",
"SampleDate"), row.names = c(NA, 15L), class = "data.frame")
?
wt$SampleDate <- as.Date(wt$SampleDate) ?wt
library(forecast)library(ggplot2)pond <-
ts(wt$AvgWeight,start=3,frequency=52)pond?d.arima <-
auto.arima(pond)d.forecast <- forecast(d.arima, level = c(95), h =
3)d.forecast

autoplot(d.forecast) + xlim(7, 101)Error in unit(x, default.units) : 'x'
and 'units' must have length > 0

Take a look at the attached plot
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