plot_line: Plot data as a line chart

In tscv: Functions and Utilities for Tidy Time Series Forecasting and Time Series Cross-Validation

Plot data as a line chart

Description

Create a line chart for one or more time series or grouped numeric variables.

Usage

plot_line(
  data,
  x,
  y,
  facet_var = NULL,
  facet_scale = "free",
  facet_nrow = NULL,
  facet_ncol = NULL,
  color = NULL,
  title = NULL,
  subtitle = NULL,
  xlab = NULL,
  ylab = NULL,
  caption = NULL,
  line_size = 0.75,
  line_type = "solid",
  line_color = "grey35",
  line_alpha = 1,
  theme_set = theme_tscv(),
  theme_config = list(),
  ...
)

Arguments

data	A data.frame, tibble, or tsibble in long format.
x	Unquoted column in data used on the x-axis.
y	Unquoted column in data containing numeric values shown on the y-axis.
facet_var	Optional unquoted column in data used for faceting.
facet_scale	Character value defining facet axis scaling. Common values are "free", "fixed", "free_x", and "free_y".
facet_nrow	Optional integer. Number of rows in the facet layout.
facet_ncol	Optional integer. Number of columns in the facet layout.
color	Optional unquoted column in data used to map line color.
title	Character value. Plot title.
subtitle	Character value. Plot subtitle.
xlab	Character value. Label for the x-axis.
ylab	Character value. Label for the y-axis.
caption	Character value. Plot caption.
line_size	Numeric value defining the line width.
line_type	Character or numeric value defining the line type.
line_color	Character value defining the line color. Ignored when color is supplied.
line_alpha	Numeric value between 0 and 1 defining line transparency.
theme_set	A complete ggplot2 theme.
theme_config	A named list with additional arguments passed to ggplot2::theme().
...	Currently not used.

Details

plot_line() is a convenience wrapper around ggplot2::geom_line() for plotting data in long format. It supports optional grouping by color, optional faceting, and the default tscv theme.

The arguments x, y, facet_var, and color are passed as unquoted column names.

If color is supplied, line colors are mapped to that variable and line_color is ignored. If color is not supplied, all lines are drawn using line_color.

Additional theme settings can be supplied through theme_config. This should be a named list of arguments passed to ggplot2::theme().

Value

An object of class ggplot.

See Also

Other data visualization: plot_bar(), plot_density(), plot_histogram(), plot_point(), plot_qq(), scale_color_tscv(), scale_fill_tscv(), theme_tscv(), tscv_cols(), tscv_pal()

Examples

library(dplyr)

data <- M4_monthly_data |>
  filter(series %in% c("M23100", "M14395"))

plot_line(
  data = data,
  x = index,
  y = value,
  facet_var = series,
  title = "M4 Monthly Time Series",
  subtitle = "Selected monthly series from the M4 forecasting competition",
  xlab = "Time",
  ylab = "Value",
  caption = "Data: M4 Forecasting Competition"
)

plot_line(
  data = data,
  x = index,
  y = value,
  color = series,
  title = "M4 Monthly Time Series",
  xlab = "Time",
  ylab = "Value",
  line_size = 1.5
)

tscv documentation built on May 13, 2026, 9:07 a.m.