I've wrote some code to simulate a random walk in 2 dimensions on a lattice.
Basically I want to add something in to make it plot it point by point so
you can see what is going on.
Heres my code for the random walk in 2d
RW2D<-function(N)
{
i<-0
xdir<-0
ydir<-0
xpos<-vector()
xpos[1]<-xdir
ypos<-vector()
ypos[1]<-ydir
for (i in 1:N-1)
{
r<-runif(1)
if(r<=0.25) {xdir<-xdir+1}
if(r>0.25 && r<=0.5) {xdir<-xdir-1}
if(r>0.5 && r<=0.75) {ydir<-ydir +1}
if(r>0.75) {ydir<-ydir-1}
xpos[i+1]<-xdir
ypos[i+1]<-ydir
}
return(cbind(xpos,ypos))
}
rw<-RW2D(10000)
xmin<-min(rw[,1])
xmax<-max(rw[,1])
ymin<-min(rw[,2])
ymax<-max(rw[,2])
plot(rw[,1],rw[,2],type="l",xlab="x",ylab="y",main="Random Walk Simulation
In Two Dimensions",col="green4",xlim=range(xmin:xmax),ylim=range(ymin:ymax))
end<-cbind(rw[10000,1],rw[10000,2])
start<-cbind(0,0)
points(start,pch=4,col="red")
points(end,pch=4,col="red")
--
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