images function

Organize several image calls (for visualizing categorical data)

Visualize categorical by group variable

images(
  x,
  group,
  ncol = 2,
  byrow = TRUE,
  colorbar = 1,
  colorbar.space = 0.1,
  label.offset = 0.02,
  order = TRUE,
  colorbar.border = 0,
  main,
  rowcol = FALSE,
  plotfun = NULL,
  axis1,
  axis2,
  mar,
  col = list(c("#EFF3FF", "#BDD7E7", "#6BAED6", "#2171B5"), c("#FEE5D9", "#FCAE91",
    "#FB6A4A", "#CB181D"), c("#EDF8E9", "#BAE4B3", "#74C476", "#238B45"), c("#FEEDDE",
    "#FDBE85", "#FD8D3C", "#D94701")),
  ...
)

Arguments

• x: data.frame or matrix
• group: group variable
• ncol: number of columns in layout
• byrow: organize by row if TRUE
• colorbar: Add color bar
• colorbar.space: Space around color bar
• label.offset: label offset
• order: order
• colorbar.border: Add border around color bar
• main: Main title
• rowcol: switch rows and columns
• plotfun: Alternative plot function (instead of 'image')
• axis1: Axis 1
• axis2: Axis 2
• mar: Margins
• col: Colours
• ...: Additional arguments to lower level graphics functions

Examples

X <- matrix(rbinom(400,3,0.5),20)
group <- rep(1:4,each=5)
images(X,colorbar=0,zlim=c(0,3))
images(X,group=group,zlim=c(0,3))
## Not run:

images(X,group=group,col=list(RColorBrewer::brewer.pal(4,"Purples"),
                               RColorBrewer::brewer.pal(4,"Greys"),
                               RColorBrewer::brewer.pal(4,"YlGn"),
                               RColorBrewer::brewer.pal(4,"PuBuGn")),colorbar=2,zlim=c(0,3))
## End(Not run)

images(list(X,X,X,X),group=group,zlim=c(0,3))
images(list(X,X,X,X),ncol=1,group=group,zlim=c(0,3))
images(list(X,X),group,axis2=c(FALSE,FALSE),axis1=c(FALSE,FALSE),
      mar=list(c(0,0,0,0),c(0,0,0,0)),yaxs="i",xaxs="i",zlim=c(0,3))

Author(s)

Klaus Holst