add a flow between two nodes

flow(
  from,
  to,
  label = NULL,
  pos = NULL,
  label_pos = NULL,
  label_gap = NULL,
  label_x = NULL,
  label_y = NULL,
  label_col = "black",
  label_font = 3,
  label_cex = 0.8,
  arr_type = "triangle",
  arr_col = "black",
  arr_length = 0.15,
  arr_width = NULL,
  arr_lty = 1,
  name_from = deparse(substitute(from)),
  name_to = deparse(substitute(to)),
  ...
)

Arguments

from	start node
to	end node
label	label to draw on flow
pos	a decimal between 0 and 1 giving the position of the flow relative to the nodes. Where 0 = bottom/left and 1 = top/right of the interval over which the nodes overlap.
label_pos	a decimal between 0 and 1 giving the position along the flow to draw `label`, where 0 = bottom / left and 1 = top/right
label_gap	distance from the flow at which to draw the label, default = 0.1
label_x	x co-ordinate of label position, overrides use of `label_pos` and / or `label_gap`
label_y	y co-ordinate of label position, overrides use of `label_pos` and / or `label_gap`
label_col	colour of `label`, defaults to black
label_font	font of `label`, defaults to 3
label_cex	label cex, defaults to 0.8
arr_type	type of arrow head to draw default = triangle
arr_col	colour of arrow default = black
arr_length	length of arrow head, defaults to 0.2
arr_width	width of arrow head, defaults to 0.1
arr_lty	lty of arrow, defaults to 1
name_from	internal argument used for informative error messages
name_to	internal argument used for informative error messages
...	additional formatting arguments to arrow()

Value

returns the start and end points of the flow