AFM (version 1.2.0)

calculateDirectionalVariograms: Calculate experimental directional semi-variograms

Description

calculate four experimental directional variograms of an AFMImage with the variogram function of the gstat package. The directional semi-variogram can be used to check the isotropy of the sample. Note: The sample will be isotropic if the slopes of the four variograms are similar.

Usage

calculateDirectionalVariograms(AFMImageVariogramAnalysis, AFMImage)

Arguments

AFMImageVariogramAnalysis

an AFMImageVariogramAnalysis to manage and store the result of variogram analysis

AFMImage

an AFMImage from Atomic Force Microscopy

Value

• Four directional variograms

Details

calculateDirectionalVariograms returns the directional variograms

Examples

library(AFM)
library(ggplot2)

data(AFMImageOfRegularPeaks)
variogramAnalysis<-AFMImageVariogramAnalysis(sampleFitPercentage=3.43)
varios<-AFM::calculateDirectionalVariograms(AFMImage= AFMImageOfRegularPeaks, 
                                            AFMImageVariogramAnalysis= variogramAnalysis)
dist<-gamma<-NULL
p <- ggplot(varios, aes(x=dist, y=gamma,  
                        color= as.factor(dir.hor), 
                        shape=as.factor(dir.hor)))
p <- p + expand_limits(y = 0)
p <- p + geom_point()
p <- p + geom_line()
p <- p + ylab("semivariance (nm^2)")
p <- p + xlab("distance (nm)")
p <- p + ggtitle("Directional")
p