spdep (version 0.6-15)

hopkins: Hopkins burnt savanna herb remains

Description

A 20m square is divided into 40 by 40 0.5m quadrats. Observations are in tens of grams of herb remains, 0 being from 0g to less than 10g, and so on. Analysis was mostly conducted using the interior 32 by 32 grid.

Usage

data(hopkins)

Format

The format is: num [1:40, 1:40] 0 0 0 0 0 0 0 0 0 1 ...

References

Hopkins, B., 1965 Observations on savanna burning in the Olokemeji Forest Reserve, Nigeria. Journal of Applied Ecology, 2, 367--381.

Examples

# NOT RUN {
data(hopkins)
image(1:32, 1:32, hopkins[5:36,36:5], breaks=c(-0.5, 3.5, 20),
 col=c("white", "black"))
box()
# }