我想使用 R 添加一条抛物线，表示 95% 的置信极限到这个抛硬币图：
x <- sample(c(-1,1), 60000, replace = TRUE)
plot.ts(cumsum(x), ylim=c(-250,250))
Here is an example of what I'm looking for:
UPDATE:@bill_080 的回答非常好。不过我已经计算了 100,000 次抛硬币：
str(100ktoss)
num [1:100000] -1 1 1 1 -1 -1 1 -1 -1 -1 ...
and I really want to just add the 95% limit to that plot:
plot.ts(cumsum(100ktoss))
我花了几个小时来计算我的 100K 硬币抛掷次数，当我尝试使用 @bill_080 的代码进行复制时，我耗尽了内存（100,000 次）。
最终更新：好的。最后一个问题。我在一张图表上绘制了几轮累积命中的图，每轮开始时都固定为零（实际上是 1 或 -1，具体取决于是赢还是输）。
>str(1.ts)
Time-Series [1:35] from 1 to 35: 1 2 1 2 3 4 5 4 5 6 ...
>str(2.ts)
Time-Series [1:150] from 36 to 185: -1 0 1 0 -1 -2 -1 0 1 2 ...
我想为每个段添加相同的 95% 限制，就像这样。现在解决了:
@bill_080 非常感谢。这是最终产品：
尝试这个。所有循环都是for循环，因此您可以轻松添加更多计算。
#Set the number of bets and number of trials and % lines
numbet <- 6000 #6000 bets
numtri <- 1000 #Run 1000 trials of the 6000 bets
perlin <- 0.05 #Show the +/- 5% lines on the graph
rantri <- 60 #The 60th trial (just a random trial to be drawn)
#Fill a matrix where the rows are the cumulative bets and the columns are the trials
xcum <- matrix(NA, nrow=numbet, ncol=numtri)
for (i in 1:numtri) {
x <- sample(c(-1,1), numbet, replace = TRUE)
xcum[,i] <- cumsum(x)
}
#Plot the trials as transparent lines so you can see the build up
matplot(xcum, type="l", xlab="Number of Bets", ylab="Cumulative Sum", main="Cumulative Results", col=rgb(0.01, 0.01, 0.01, 0.02))
grid()
#Sort the trials of each bet so you can pick out the desired %
xcumsor <- xcum
for (i in 1:numbet) {
xcumsor[i,] <- xcum[i,order(xcum[i,])]
}
#Draw the upper/lower limit lines and the 50% probability line
lines(xcumsor[, perlin*numtri], type="l", lwd=2, col=rgb(1, 0.0, 0.0)) #Lower limit
lines(xcumsor[, 0.5*numtri], type="l", lwd=3, col=rgb(0, 1, 0.0)) #50% Line
lines(xcumsor[, (1-perlin)*numtri], type="l", lwd=2, col=rgb(1, 0.0, 0.0)) #Upper limit
#Show one of the trials
lines(xcum[, rantri], type="l", lwd=1, col=rgb(1, 0.8, 0)) #Random trial
#Draw the legend
legend("bottomleft", legend=c("Various Trials", "Single Trial", "50% Probability", "Upper/Lower % Limts"), bg="white", lwd=c(1, 1, 3, 2), col=c("darkgray", "orange", "green", "red"))
编辑1================================================== =========
如果您只是想绘制 +/- 5% 的线，那么它只是一个平方根函数。这是代码：
#Set the bet sequence and the % lines
betseq <- 1:100000 #1 to 100,000 bets
perlin <- 0.05 #Show the +/- 5% lines on the graph
#Calculate the Upper and Lower limits using perlin
#qnorm() gives the multiplier for the square root
upplim <- qnorm(1-perlin)*sqrt(betseq)
lowlim <- qnorm(perlin)*sqrt(betseq)
#Get the range for y
yran <- range(upplim, lowlim)
#Plot the upper and lower limit lines
plot(betseq, upplim, ylim=yran, type="l", xlab="", ylab="")
lines(betseq, lowlim)
编辑2================================================== ==
要在正确的位置添加抛物线，如果定义一个函数可能会更容易。请记住，因为新函数 (dralim) uses lines，在调用之前该图必须存在dralim。使用一些与编辑 1 中的代码相同的变量：
#Set the bet sequence and the % lines
betseq <- 0:700 #0 to 700 bets
perlin <- 0.05 #Show the +/- 5% lines on the graph
#Define a function that plots the upper and lower % limit lines
dralim <- function(stax, endx, perlin) {
lines(stax:endx, qnorm(1-perlin)*sqrt((stax:endx)-stax))
lines(stax:endx, qnorm(perlin)*sqrt((stax:endx)-stax))
}
#Build the plot area and draw the vertical dashed lines
plot(betseq, rep(0, length(betseq)), type="l", ylim=c(-50, 50), main="", xlab="Trial Number", ylab="Cumulative Hits")
abline(h=0)
abline(v=35, lty="dashed") #Seg 1
abline(v=185, lty="dashed") #Seg 2
abline(v=385, lty="dashed") #Seg 3
abline(v=485, lty="dashed") #Seg 4
abline(v=585, lty="dashed") #Seg 5
#Draw the % limit lines that correspond to the vertical dashed lines by calling the
#new function dralim.
dralim(0, 35, perlin) #Seg 1
dralim(36, 185, perlin) #Seg 2
dralim(186, 385, perlin) #Seg 3
dralim(386, 485, perlin) #Seg 4
dralim(486, 585, perlin) #Seg 5
dralim(586, 701, perlin) #Seg 6
