func savePlot(title, directory string, plot *plot.Plot) {
_, err := os.Stat(directory)
if os.IsNotExist(err) {
os.MkdirAll(directory, 0755)
}
plotFilename := strings.Replace(directory+"/"+title+".eps", " ", "", -1)
err = plot.Save(4, 4, plotFilename)
if err != nil {
panic(err)
}
}