plot.tbl_ts method?

[mpadge]

Please feel free to judge this as out-of-scope. It's just a thought raised by @rkillick, and which would personally make sense to me.

What i would like

Default plot on tsibble objects to put the index axis on the horizontal (unless otherwise specified or controlled).

Current behaviour

library (tsibble)
n <- 10
vals <- 1:n
x <- tsibble (y = runif (n),
              time = vals,
              index = time)
plot (x, type = "l")

The index variable is automatically put on 2nd (y) axis, because it's the 2nd column.

A solution

(This is nothing like what implemented code should look like, but illustrates the point.)

plot.tbl_ts <- function (x, ...) {
    i <- match (index_var (x), names (x))
    o <- c (i, seq (ncol (x)) [-i])
    plot.default (x [, o], ...)
}

plot (x, type = "l")

^{Created on 2020-06-25 by the reprex package (v0.3.0)}

There is current no default plot.tbl_ts method, for likely very good and understandable reasons. Foremost among these is unintended side effects, which this makes no attempt to anticipate. Nevertheless might be worth thinking about?

[rkillick]

Users of ts objects would be expecting time on the x-axis as this is the default plot.ts. As Mark states, there may be a reason for not having a separate plot.tbl_ts method, but if not then the anticipated behaviour would be time on the x-axis.

[earowang]

All graphical methods for tsibble are available in the {feasts} package. We provide autoplot() for time series plots using ggplot, instead of plot().