flowlowup {cartograflow}

Extracts the triangular sub-matrix of flows

Description

Extracts the upper or lower triangular part of a matrix

Usage

flowlowup(tab, origin = NULL, destination = NULL, fij = NULL, lowup, format, x)

Arguments

tab

is the input flow dataset

origin

the place of origin code

destination

the place of destination code

fij

the flow value between origin and destination places

lowup

for selecting lower or upper triangular sub-portion of the original matrix. See Details.

format

specify the flow dataset format, "M " for square matrix [n*n] or "L" for long [i,j,data]

x

enter the Enter the triangular part to be extracted: "low", "up". See Details.

Details

This function compute for all pairs or origin-destination places (i,j) a lower "low" or upper "up" triangular sub-portion of the original matrix - x = "up" for the part above the main diagonal
- x = "low" for the part below the main diagonal

Examples

library(cartograflow)
data(flowdata)

###Extract the upper part of the matrix : Long format
tab_up <- flowlowup(flows, format="L", lowup="up")
tab_low<-flowlowup(flows, format="L", lowup="low")