addGGArrows: Add Gradient Vector Arrows to Gradient Field Heatmap.
In kerschke/moPLOT: Visualizing Multi-Objective Optimization Problems

addGGArrows

R Documentation

Add Gradient Vector Arrows to Gradient Field Heatmap.

Add vectors indicating the gradient field to the heatmap of the cumulated path lengths.

addGGArrows(
  g,
  centers,
  gradients,
  fac = 0.025,
  arrow_len = unit(0.075/2, "inches"),
  nColumns = 10L,
  nRows = 10L,
  ...
)

`g`	[`ggplot2::ggplot`] `ggplot`-object as created by `ggplotHeatmap`.
`centers`	[`matrix`] Matrix containing the points of a grid of cells, for which the lengths of cumulated gradient paths should be computed. Each row corresponds to a single point.
`gradients`	[`matrix`] Matrix containing the multi-objective gradients for each point of `centers`.
`fac`	[`⁠[numeric]⁠`] Factor used for scaling the lengths of the gradient vectors. The default is `0.025`.
`arrow_len`	[`⁠[unit]⁠`] Length of the arrow tips (default: `unit(0.075 / 2, "inches")`).
`nColumns`	[`⁠[integer]⁠`] How many columns of arrows should be drawn? The default is `10`.
`nRows`	[`⁠[integer]⁠`] How many rows of arrows should be drawn? The default is `10`.
`...`	any Further arguments to be passed to the `geom_tile` function of `ggplot`.