ggplot_parallel: ggplot_parallel

Description

Makes a basic ggplot2 chart for displaying DEXi alternatives using parallel axes. Generally, axes are uniformly scaled to the [0,1] interval.

Usage

ggplot_parallel(
  model,
  alternatives = NULL,
  attids = NULL,
  aggregate = c("minmax", "min", "max", "mean", "none"),
  name = "name",
  shift = 0.01
)

Value

A basic 'ggplot2' chart. Generally, this chart needs to be further enhanced by graph layers, such as themes, labels, geom_points() and geom_line(). See plotalt_parallel() that already provides some such layers.

Arguments

model: A DexiModel object. Required.
alternatives: A data.frame of alternatives (normally an output of evaluate()) or indices to model$alternatives. The default value NULL selects the whole model$alternatives.
attids: character(). A character vector of DexiAttribute IDs to be included in the result. Default: all model attributes.
aggregate: One of "minmax", "min", "max", "mean" or "none". Determines how to aggregate alternatives' values that are represented by sets or distributions.
name: character(1), The name of the column in alternatives that contains alternatives' names. Default: "name".
shift: numeric(1). Used to "shift" numeric values by a small amount to avoid overlapping lines in charts. Default: 0.01. You may want to experiment with charts to determine the right value,

Details

Uses GGally::ggparcoord() and requires package "GGally" to be installed. Data presented in the chart is prepared by scale_alternatives().

Examples

Run this code

if (requireNamespace("GGally", quietly = TRUE)) {

# Load "Car.dxi"
CarDxi <- system.file("extdata", "Car.dxi", package = "DEXiR")
Car <- read_dexi(CarDxi)

# Plot all Car$alternatives with points and lines
ggplot_parallel(Car) + ggplot2::geom_line(linewidth = 2) + ggplot2::geom_point(size = 3)
}