compare.matrix compares the values within two
matrices (e.g., ESRI ArcInfo ASCII raster files) and
produces a biplot that shows the frequency of each data
combination shared between the matrices. The plot is
overlayed with contour lines that demarcate parts of the
the plot that share the same frequency of data
combinations.
NOTE: it is assumed the
matrices are of the same extent, cell size and scaled to be
the same units.
Usage
compare.matrix(x, y, nbins, ...)
Arguments
x
a matrix of data; the matrix can be a raster of
class 'asc' (adehabitat package), 'RasterLayer' (raster
package) or 'SpatialGridDataFrame' (sp package)
y
a matrix of data of the same extent, cell size
and class as 'x'
nbins
number of equally spaced bins used to
partition range of values in 'x' & 'y'
...
other graphical parameters defined by image(),
contour(), or plot()
#create some simple objects of class 'asc'
tasc = as.asc(matrix(rep(x=1:10, times=1000),nr=100)); print(tasc)
#modify the asc objects so that they are slightly different
tasc1 = tasc + runif(n = 10000, min = -1, max = 1)
tasc2 = tasc + rnorm(n = 10000, mean = 1, sd = 1)
#create some images
#basic plot showing the density of data combinations shared
#by the two matrices
compare.matrix(tasc1,tasc2,20)
#same as previous but with data partioned amoung more bins
compare.matrix(tasc1,tasc2,50)
#same as previous but altering the number of contour levels
#and adding more graphical functions
compare.matrix(tasc1,tasc2,50,nlevels=5, xlab='asc1',ylab='asc2',
main='Comparison between asc and asc2', bg="grey")
Results
R version 3.3.1 (2016-06-21) -- "Bug in Your Hair"
Copyright (C) 2016 The R Foundation for Statistical Computing
Platform: x86_64-pc-linux-gnu (64-bit)
R is free software and comes with ABSOLUTELY NO WARRANTY.
You are welcome to redistribute it under certain conditions.
Type 'license()' or 'licence()' for distribution details.
R is a collaborative project with many contributors.
Type 'contributors()' for more information and
'citation()' on how to cite R or R packages in publications.
Type 'demo()' for some demos, 'help()' for on-line help, or
'help.start()' for an HTML browser interface to help.
Type 'q()' to quit R.
> library(SDMTools)
> png(filename="/home/ddbj/snapshot/RGM3/R_CC/result/SDMTools/compare.matrix.Rd_%03d_medium.png", width=480, height=480)
> ### Name: compare.matrix
> ### Title: Biplot Comparison of Matrices
> ### Aliases: compare.matrix
>
> ### ** Examples
>
> #create some simple objects of class 'asc'
> tasc = as.asc(matrix(rep(x=1:10, times=1000),nr=100)); print(tasc)
Raster map of class "asc":
Cell size: 1
Number of rows: 100
Number of columns: 100
Type: numeric
> #modify the asc objects so that they are slightly different
> tasc1 = tasc + runif(n = 10000, min = -1, max = 1)
> tasc2 = tasc + rnorm(n = 10000, mean = 1, sd = 1)
>
> #create some images
> #basic plot showing the density of data combinations shared
> #by the two matrices
> compare.matrix(tasc1,tasc2,20)
>
> #same as previous but with data partioned amoung more bins
> compare.matrix(tasc1,tasc2,50)
>
> #same as previous but altering the number of contour levels
> #and adding more graphical functions
> compare.matrix(tasc1,tasc2,50,nlevels=5, xlab='asc1',ylab='asc2',
+ main='Comparison between asc and asc2', bg="grey")
>
>
>
>
>
> dev.off()
null device
1
>
providing 
.
