AFM (version 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

# NOT RUN {
library(AFM)
library(ggplot2)

data(AFMImageOfRegularPeaks)
variogramAnalysis<-AFMImageVariogramAnalysis(sampleFitPercentage=3.43/100)
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
# }