cartograflow (version 1.0.0)

flowmap: Mapping a flow matrix origin-destination

Description

Mapping a flow matrix origin-destination

Usage

flowmap(tab, format, fdc, code, filter, threshold, taille, a.head,
  a.length, a.angle, a.col)

Arguments

tab

the input flow dataset .csv

format

the flow dataset format : M=matrice or L=long.

fdc

the geographical background file .shp

code

is the column with the spatial units ID

filter

allows you to filter (or not) the flow dataset. See details

threshold

is the value of the threshold criterion used to filter the values. The default is 1.

taille

is a graphical parameter for modifying the width of the feature

a.head

integer code, determining the kind of arrows to be drawn. See Details

a.length

length of the edges of the arrow head (in inches).

a.angle

angle from the shaft of the arrow to the edge of the arrow head.

a.col

color of the arrows

Value

a matrix or a list with the correct tabflow ID code

The resulting flowmap

Details

The flow dataset must be converted to a dataframe for optimal performance (troubles remains with tibble format)

If filter = FALSE, all the matrice values are plot [(n*(n-1)] cells, i.e. all links out of the main diagonal. If filter = TRUE only non-zero values are plotted, i.e. existing links with or without threshold. The default threshold is set to 1.

a.head is for applying an arrow or not -- code=0 : the link has no head - no arrow -- code=1 : an arrow is draw at (x0[i], y0[i]). -- code=2 : an arrow is draw at (x1[j], y1[j]) -- code=3 : an arrow is draw at both nodes.

Examples

# NOT RUN {
library(cartograflow)
data(flowdata)
bkg<- system.file("shape/MGP_TER.shp", package="cartograflow",
                  lib.loc = NULL, mustWork = TRUE)
flowmap(flows,format="L",bkg,code = "EPT_NUM",filter = TRUE,
         threshold = 20,taille = 5,a.head = 1,a.length = 0.05)
# }