R/useful_functions.R

In allanecology/BetaDivMultifun: Testing effects of multitrophic beta-diversity and land-use intensity (LUI) on ecosystem multifunctionality

#' Panel hist
#' 
#' Function from https://www.rdocumentation.org/packages/graphics/versions/3.6.2/topics/pairs
#' add histogram panel to `pairs()` plot.
#' @return histogram panel in paris() plot
panel.hist <- function(x, ...)
{
  usr <- par("usr"); on.exit(par(usr))
  par(usr = c(usr[1:2], 0, 1.5) )
  h <- hist(x, plot = FALSE)
  breaks <- h$breaks; nB <- length(breaks)
  y <- h$counts; y <- y/max(y)
  rect(breaks[-nB], 0, breaks[-1], y, col = "cyan", ...)
}
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#' Panel cor
#' 
#' Function from https://www.rdocumentation.org/packages/graphics/versions/3.6.2/topics/pairs
#' add correlation panel to `pairs()` plot.
#' @return correlation panel in paris() plot
panel.cor <- function(x, y, digits = 2, prefix = "", cex.cor, ...)
{
  usr <- par("usr"); on.exit(par(usr))
  par(usr = c(0, 1, 0, 1))
  r <- abs(cor(x, y))
  txt <- format(c(r, 0.123456789), digits = digits)[1]
  txt <- paste0(prefix, txt)
  if(missing(cex.cor)) cex.cor <- 0.8/strwidth(txt)
  text(0.5, 0.5, txt, cex = cex.cor * r)
}
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