Nothing

```
library(RFOC)
print("Demonstration of Stereonet Usage")
print("Draw an Equal-Angle Stereonet (Schmidt Net)")
print("Create a stereo net structure and save, then plot")
MN = makenet()
pnet(MN)
readline("To Continue Hit Enter Key\n")
pnet(MN)
mtext(side=3,"Left Click 3 times on net to record points")
print("Left Click 3 times on net to record points")
rpoints = AXpoint(UP=TRUE, col=2, n=3)
mtext(side=1, "Left Click 3 times on net to record more points")
print("Left Click 3 times on net to record more points")
bpoints = AXpoint(UP=TRUE, col=4, n=3)
readline("To Continue Hit Enter Key\n")
mtext(side=3,"POints are saved, and replotted:")
pnet(MN)
qpoint(rpoints$az, rpoints$dip, UP=TRUE, col=2)
qpoint(bpoints$az, bpoints$dip, UP=TRUE, col=4)
readline("To Continue Hit Enter Key\n")
pnet(MN)
qpoint(rpoints$az[1], rpoints$dip[1], UP=TRUE, col=2)
dip = rpoints$dip[1]
rplane = lowplane(rpoints$az[1]-90, rpoints$dip[1], UP=TRUE, col='red')
########## must subtract 90 from the azimuth to get correct orientation
mtext(side=3,"First point is chosen and plotted as a pole:")
readline("To Continue Hit Enter Key\n")
pnet(MN)
addsmallcirc(34, 52, 10, lty=2)
mtext(side=3,"Click three times in small black circle")
rpoints = AXpoint(UP=TRUE, col=2, n=3)
########### plot great circles associated with poles
for(i in 1:length(rpoints$az)) {
rplane = lowplane(rpoints$az[i]-90, rpoints$dip[i], UP=TRUE, col='red')
}
##########
readline("To Continue Hit Enter Key\n")
########## ########## create a bunch of poles and calcualte statistics
az = rnorm(25, m=-134, sd=20)
dip = rnorm(25, m=52, sd=10)
pnet(MN)
qpoint(az, dip, UP=FALSE, col=2)
A95 = alpha95(az, dip)
qpoint(A95$Dr, 90-A95$Ir, UP=FALSE, col='black', pch=6)
addsmallcirc(A95$Dr, 90-A95$Ir, A95$Alph95, lty=1, lwd=2)
mtext(side=3,"Random Points and 95% Confidence of Mean Vector")
readline("To Continue Hit Enter Key\n")
########## ##########
library(MASS)
######### create structure of points:
PZZ = focpoint(az, 90-dip, col = "red", pch = 3, lab = "",
UP = FALSE, PLOT = FALSE)
KP = kde2d(PZZ$x, PZZ$y, n = 100, lims = c(-1, 1, -1, 1))
########## use meshgrid to set up image:
###### blank out points outside of sphere
M = RPMG::meshgrid(KP$x, KP$y)
flag = sqrt(M$x^2 + M$y^2) > 1
KP$z[flag] = NA
pnet(MN)
########### location of center of focal sphere:
fx = 0
fy = 0
## size of focal sphere:
siz = 1
########## do image:
image(fx + siz * KP$x, fy + siz * KP$y, KP$z, add = TRUE,
col = terrain.colors(100))
pnet(MN, add=TRUE)
mtext(side=3,"Smoothed Random Points")
readline("To Continue Hit Enter Key\n")
########## add contours
cont.col ='blue'
cline.list = contourLines(fx + siz * KP$x, fy + siz * KP$y,
KP$z)
templines <- function(clines) {
cx = clines[[2]]
cy = clines[[3]]
flag = sqrt((cx - fx)^2 + (cy - fy)^2) > siz
cx[flag] = NA
cy[flag] = NA
lines(cx, cy, col = cont.col)
}
invisible(lapply(cline.list, templines))
points(PZZ$x, PZZ$y)
points(PZZ$x, PZZ$y)
```

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