R version 3.2.3 (2015-12-10) -- "Wooden Christmas-Tree"
Copyright (C) 2015 The R Foundation for Statistical Computing
Platform: x86_64-pc-linux-gnu (64-bit)

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> x <- c(4,7,9,6,9,13,18,8,15,4,8,14)
> par1 = '12'
> par1 <- '12'
> #'GNU S' R Code compiled by R2WASP v. 1.2.327 (Mon, 30 Nov 2015 07:01:18 +0000)
> #Author: root
> #To cite this work: Wessa P., (2015), Mean Plot (v1.0.5) in Free Statistics Software (v$_version), Office for Research Development and Education, URL http://www.wessa.net/rwasp_meanplot.wasp/
> #Source of accompanying publication: Office for Research, Development, and Education
> #
> par1 <- as.numeric(par1)
> x <- na.omit(x)
> (n <- length(x))
[1] 12
> (np <- floor(n / par1))
[1] 1
> arr <- array(NA,dim=c(par1,np+1))
> darr <- array(NA,dim=c(par1,np+1))
> ari <- array(0,dim=par1)
> dx <- diff(x)
> j <- 0
> for (i in 1:n)
+ {
+ j = j + 1
+ ari[j] = ari[j] + 1
+ arr[j,ari[j]] <- x[i]
+ darr[j,ari[j]] <- dx[i]
+ if (j == par1) j = 0
+ }
> ari
 [1] 1 1 1 1 1 1 1 1 1 1 1 1
> arr
      [,1] [,2]
 [1,]    4   NA
 [2,]    7   NA
 [3,]    9   NA
 [4,]    6   NA
 [5,]    9   NA
 [6,]   13   NA
 [7,]   18   NA
 [8,]    8   NA
 [9,]   15   NA
[10,]    4   NA
[11,]    8   NA
[12,]   14   NA
> darr
      [,1] [,2]
 [1,]    3   NA
 [2,]    2   NA
 [3,]   -3   NA
 [4,]    3   NA
 [5,]    4   NA
 [6,]    5   NA
 [7,]  -10   NA
 [8,]    7   NA
 [9,]  -11   NA
[10,]    4   NA
[11,]    6   NA
[12,]   NA   NA
> arr.mean <- array(NA,dim=par1)
> arr.median <- array(NA,dim=par1)
> arr.midrange <- array(NA,dim=par1)
> for (j in 1:par1)
+ {
+ arr.mean[j] <- mean(arr[j,],na.rm=TRUE)
+ arr.median[j] <- median(arr[j,],na.rm=TRUE)
+ arr.midrange[j] <- (quantile(arr[j,],0.75,na.rm=TRUE) + quantile(arr[j,],0.25,na.rm=TRUE)) / 2
+ }
> overall.mean <- mean(x)
> overall.median <- median(x)
> overall.midrange <- (quantile(x,0.75) + quantile(x,0.25)) / 2
> postscript(file="/var/wessaorg/rcomp/tmp/1tbf41457171708.ps",horizontal=F,onefile=F,pagecentre=F,paper="special",width=8.3333333333333,height=5.5555555555556) 
> plot(arr.mean,type='b',ylab='mean',main='Mean Plot',xlab='Periodic Index')
> mtext(paste('#blocks = ',np))
> abline(overall.mean,0)
> dev.off()
null device 
          1 
> postscript(file="/var/wessaorg/rcomp/tmp/2uksa1457171708.ps",horizontal=F,onefile=F,pagecentre=F,paper="special",width=8.3333333333333,height=5.5555555555556) 
> plot(arr.median,type='b',ylab='median',main='Median Plot',xlab='Periodic Index')
> mtext(paste('#blocks = ',np))
> abline(overall.median,0)
> dev.off()
null device 
          1 
> postscript(file="/var/wessaorg/rcomp/tmp/3okyh1457171708.ps",horizontal=F,onefile=F,pagecentre=F,paper="special",width=8.3333333333333,height=5.5555555555556) 
> plot(arr.midrange,type='b',ylab='midrange',main='Midrange Plot',xlab='Periodic Index')
> mtext(paste('#blocks = ',np))
> abline(overall.midrange,0)
> dev.off()
null device 
          1 
> postscript(file="/var/wessaorg/rcomp/tmp/4a3sy1457171708.ps",horizontal=F,onefile=F,pagecentre=F,paper="special",width=8.3333333333333,height=5.5555555555556) 
> z <- data.frame(t(arr))
> names(z) <- c(1:par1)
> (boxplot(z,notch=TRUE,col='grey',xlab='Periodic Index',ylab='Value',main='Notched Box Plots - Periodic Subseries'))
$stats
     [,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9] [,10] [,11] [,12]
[1,]    4    7    9    6    9   13   18    8   15     4     8    14
[2,]    4    7    9    6    9   13   18    8   15     4     8    14
[3,]    4    7    9    6    9   13   18    8   15     4     8    14
[4,]    4    7    9    6    9   13   18    8   15     4     8    14
[5,]    4    7    9    6    9   13   18    8   15     4     8    14

$n
 [1] 1 1 1 1 1 1 1 1 1 1 1 1

$conf
     [,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9] [,10] [,11] [,12]
[1,]    4    7    9    6    9   13   18    8   15     4     8    14
[2,]    4    7    9    6    9   13   18    8   15     4     8    14

$out
numeric(0)

$group
numeric(0)

$names
 [1] "1"  "2"  "3"  "4"  "5"  "6"  "7"  "8"  "9"  "10" "11" "12"

> dev.off()
null device 
          1 
> postscript(file="/var/wessaorg/rcomp/tmp/5prmz1457171708.ps",horizontal=F,onefile=F,pagecentre=F,paper="special",width=8.3333333333333,height=5.5555555555556) 
> z <- data.frame(t(darr))
> names(z) <- c(1:par1)
> (boxplot(z,notch=TRUE,col='grey',xlab='Periodic Index',ylab='Value',main='Notched Box Plots - Differenced Periodic Subseries'))
$stats
     [,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9] [,10] [,11] [,12]
[1,]    3    2   -3    3    4    5  -10    7  -11     4     6    NA
[2,]    3    2   -3    3    4    5  -10    7  -11     4     6    NA
[3,]    3    2   -3    3    4    5  -10    7  -11     4     6    NA
[4,]    3    2   -3    3    4    5  -10    7  -11     4     6    NA
[5,]    3    2   -3    3    4    5  -10    7  -11     4     6    NA

$n
 [1] 1 1 1 1 1 1 1 1 1 1 1 0

$conf
     [,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9] [,10] [,11] [,12]
[1,]    3    2   -3    3    4    5  -10    7  -11     4     6    NA
[2,]    3    2   -3    3    4    5  -10    7  -11     4     6    NA

$out
numeric(0)

$group
numeric(0)

$names
 [1] "1"  "2"  "3"  "4"  "5"  "6"  "7"  "8"  "9"  "10" "11" "12"

> dev.off()
null device 
          1 
> postscript(file="/var/wessaorg/rcomp/tmp/6lgvb1457171708.ps",horizontal=F,onefile=F,pagecentre=F,paper="special",width=8.3333333333333,height=5.5555555555556) 
> z <- data.frame(arr)
> names(z) <- c(1:np)
> (boxplot(z,notch=TRUE,col='grey',xlab='Block Index',ylab='Value',main='Notched Box Plots - Sequential Blocks'))
$stats
     [,1] [,2]
[1,]  4.0   NA
[2,]  6.5   NA
[3,]  8.5   NA
[4,] 13.5   NA
[5,] 18.0   NA

$n
[1] 12  0

$conf
          [,1] [,2]
[1,]  5.307253   NA
[2,] 11.692747   NA

$out
numeric(0)

$group
numeric(0)

$names
[1] "1" NA 

Warning message:
In bxp(list(stats = c(4, 6.5, 8.5, 13.5, 18, NA, NA, NA, NA, NA),  :
  some notches went outside hinges ('box'): maybe set notch=FALSE
> dev.off()
null device 
          1 
> postscript(file="/var/wessaorg/rcomp/tmp/7oin11457171708.ps",horizontal=F,onefile=F,pagecentre=F,paper="special",width=8.3333333333333,height=5.5555555555556) 
> z <- data.frame(cbind(arr.mean,arr.median,arr.midrange))
> names(z) <- list('mean','median','midrange')
> (boxplot(z,notch=TRUE,col='grey',ylab='Overall Central Tendency',main='Notched Box Plots'))
$stats
     [,1] [,2] [,3]
[1,]  4.0  4.0  4.0
[2,]  6.5  6.5  6.5
[3,]  8.5  8.5  8.5
[4,] 13.5 13.5 13.5
[5,] 18.0 18.0 18.0

$n
[1] 12 12 12

$conf
          [,1]      [,2]      [,3]
[1,]  5.307253  5.307253  5.307253
[2,] 11.692747 11.692747 11.692747

$out
numeric(0)

$group
numeric(0)

$names
[1] "mean"     "median"   "midrange"

Warning message:
In bxp(list(stats = c(4, 6.5, 8.5, 13.5, 18, 4, 6.5, 8.5, 13.5,  :
  some notches went outside hinges ('box'): maybe set notch=FALSE
> dev.off()
null device 
          1 
> 
> try(system("convert tmp/1tbf41457171708.ps tmp/1tbf41457171708.png",intern=TRUE))
character(0)
> try(system("convert tmp/2uksa1457171708.ps tmp/2uksa1457171708.png",intern=TRUE))
character(0)
> try(system("convert tmp/3okyh1457171708.ps tmp/3okyh1457171708.png",intern=TRUE))
character(0)
> try(system("convert tmp/4a3sy1457171708.ps tmp/4a3sy1457171708.png",intern=TRUE))
character(0)
> try(system("convert tmp/5prmz1457171708.ps tmp/5prmz1457171708.png",intern=TRUE))
character(0)
> try(system("convert tmp/6lgvb1457171708.ps tmp/6lgvb1457171708.png",intern=TRUE))
character(0)
> try(system("convert tmp/7oin11457171708.ps tmp/7oin11457171708.png",intern=TRUE))
character(0)
> 
> 
> proc.time()
   user  system elapsed 
  2.419   0.386   2.838