Plotting methods for tis objects
# S3 method for tis
lines(x, offset = 0.5, dropNA = FALSE, ...)
# S3 method for tis
points(x, offset = 0.5, dropNA = FALSE, ...)a tis (time indexed series) object
a number in the range [0,1] telling where in each period of x
to plot the point. 0 means the first second of each period, 1 the
last second of the period, and the default 0.5 plots each point in
the middle of the time period in which it falls.
if TRUE, observations with NA values are
dropped before calling lines.default or
points.default. See the details for why you might or might
not want to do this. The default is FALSE, to match the
behavior of lines.default and points.default.
other arguments to be passed on to lines.default or
points.default.
These are fairly simple wrappers around the lines.default and
points.default. For example, lines.tis basically does this:
lines.default(x = time(x, offset = offset), y = x, ...)
and points.tis is similar. If dropNA is TRUE, the
observations in x that are NA are dropped from the x and
y vectors sent to the .default functions. For points, this
shouldn't matter, since points.tis omits points with NA
values from the plot.
For lines the dropNA parameter does make a difference.
The help document for lines says:
"The coordinates can contain NA values. If a point contains
NA in either its x or y value, it is omitted from
the plot, and lines are not drawn to or from such points. Thus
missing values can be used to achieve breaks in lines."
Note that if the type is one of c("p", "b", "o"), the
non-NA points are still drawn, but line segments from those
points to adjacent NA points are not drawn. If dropNA = TRUE,
the NA points are dropped before calling lines.default,
and all of the remaining points will be connected with line segments
(unless suppressed by the type argument).