ggheatmap: Plot a heatmap
In rscherrer/ggsim: Tools for plotting simulation data using ggplot2

Generates a heatmap from a data frame

1	ggheatmap(data, variable, x, y, reduce = NULL, how = last, keep = NULL)

`data`	A data frame
`variable`	What variable to plot?
`x, y`	What variables for the x- and y-axes?
`reduce`	Optional list of extra shrinking steps to perform prior to summarizing the data over all tiles (as defined by combining facets, `x` and `y`). See `?shrink`.
`how`	Function used to summarize the data within each tile. Defaults to `last`. Irrelevant if the data already has one value for each tile. If `reduce` is specified, this argument must be provided explicitly as a list with one summary function for each grouping level in `reduce` and a final summary function for each tile. See `?shrink`.
`keep`	Optional extra grouping variables to keep e.g. for facetting