AFM (version 1.2.0)

checkIsotropy: Check the isotropy of a sample

Description

checkIsotropy is used to check the isotropy of an AFMImage. A directional variogram is calculated for various directions. If the variogram is very similar for all the directions then the sample is isotropic.

Usage

checkIsotropy(AFMImage, AFMImageAnalyser)

Arguments

AFMImage

an AFMImage to be analysed

AFMImageAnalyser

an AFMImageAnalyser to perform the analysis

Value

• an AFMImageAnalyser containing the directional variograms

Examples

library(AFM)
library(ggplot2)

data(AFMImageOfAluminiumInterface)
AFMImage<-extractAFMImage(AFMImageOfAluminiumInterface, 0, 0, 32)
AFMImageAnalyser<-new("AFMImageAnalyser", AFMImage= AFMImage, fullfilename = AFMImage@fullfilename)
AFMImageAnalyser<-checkIsotropy(AFMImage,AFMImageAnalyser)
varios<-AFMImageAnalyser@variogramAnalysis@directionalVariograms
p2 <- ggplot(varios, aes(x=dist, y=gamma,  
                         color= as.factor(dir.hor), shape=as.factor(dir.hor)))
p2 <- p2 + expand_limits(y = 0)
p2 <- p2 + geom_point()
p2 <- p2 + geom_line()
p2 <- p2 + ylab("semivariance (nm^2)")
p2 <- p2 + xlab("distance (nm)")
p2 <- p2 + ggtitle("Directional")
p2