mk_trn: Tabulate from-to transitions by cell

In bjornbrooks/landat: R functions for calculating IT statistics

Description

Given 3 vectors of equivalent length representing the year (or time identifier), cell ID, and group (cluster) assignment, make a transition table consisting of 4 columns indicating the year, cell, from-group (this year's group), and to-group (next year's group).

Usage

mk_trn(time, cell, group)

Arguments

time	A numeric vector of values indicating the years (or sampling points) at which each group assigment was made (e.g. 1, 2, 3,...).
cell	A numeric vector of values indicating the cell number for each group assignment.
group	A numeric vector of values indicating the group membership of each cell in each year. x into.

Value

Returns a data frame with four columns representing the year cell, from-group (this year's group), and to-group (next year's group).

Author(s)

Bjorn J. Brooks, Lars Y. Pomara, Danny C. Lee

References

PAPER TITLE.

Examples

# Test 1, Robust test of algorithm
# Make example in which only cells 2,3,4,5 experience transitions
#   (cells 1,6,7 only contain one value)
t <- c(1,1,2,1,2,3,1,2,3,1,2,1,1) # Time values
c <- c(1,2,2,3,3,3,4,4,4,5,5,6,7) # Cell IDs
g <- c(1,1,2,1,2,3,3,2,1,1,2,1,1) # Cluster groups
mk_trn(time=t, cell=c, group=g) # Make transition table
# Test 2, Test data table input
tmp <- data.frame(cell=rep(1:2, each=3),
	     time=rep(1:3, times=2),
	     cluster=c(letters[1:3], LETTERS[1:3])) # Data table
tmp # Print to screen
mk_trn(time=tmp$time, cell=tmp$cell, group=tmp$cluster) # Make trans tbl

bjornbrooks/landat documentation built on May 17, 2019, 7:32 p.m.