Extract values from a raster to produce a histogram

Source: R/plot_hist_f.R

Called by the plot_hist module in the example app and extracts values from a raster image, returning a histogram of density

plot_hist(raster, bins, palette, name, logger = NULL)

Arguments

raster

SpatRaster object

bins

The number of breaks in the histogram

palette

character. The colour palette to use

name

character. The name of the variable

logger

Stores all notification messages to be displayed in the Log Window. Insert the logger reactive list here for running in shiny, otherwise leave the default NULL

Value

a function that generates a histogram

Author

Simon Smart simon.smart@cantab.net

Examples

if (check_suggests(example = TRUE)) {
  raster <- terra::rast(ncol = 8, nrow = 8)
  raster[] <- sapply(1:terra::ncell(raster), function(x){
    rnorm(1, ifelse(x %% 8 != 0, x %% 8, 8), 3)})
  histogram <- plot_hist(raster, bins = 10, palette = "Greens", name = "Example")
  histogram()
} else {
  message('reinstall with install.packages("shinyscholar", dependencies = TRUE)
  to run this example')
}