R version 3.3.1 (2016-06-21) -- "Bug in Your Hair"
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Platform: x86_64-pc-linux-gnu (64-bit)

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> x <- c(11000,13000,15000,29000,31000,22000,36000,39000,30000,20000,18000,13000,11000,16000,20000,29000,31000,24000,40000,41000,25000,19000,19000,18000,10000,17000,25000,30000,32000,24000,38000,36000,26000,25000,26000,16000,12000,15000,21000,33000,32000,24000,41000,38000,28000,24000,30000,18000)
> 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] 48
> (np <- floor(n / par1))
[1] 4
> 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] 4 4 4 4 4 4 4 4 4 4 4 4
> arr
       [,1]  [,2]  [,3]  [,4] [,5]
 [1,] 11000 11000 10000 12000   NA
 [2,] 13000 16000 17000 15000   NA
 [3,] 15000 20000 25000 21000   NA
 [4,] 29000 29000 30000 33000   NA
 [5,] 31000 31000 32000 32000   NA
 [6,] 22000 24000 24000 24000   NA
 [7,] 36000 40000 38000 41000   NA
 [8,] 39000 41000 36000 38000   NA
 [9,] 30000 25000 26000 28000   NA
[10,] 20000 19000 25000 24000   NA
[11,] 18000 19000 26000 30000   NA
[12,] 13000 18000 16000 18000   NA
> darr
        [,1]   [,2]   [,3]   [,4] [,5]
 [1,]   2000   5000   7000   3000   NA
 [2,]   2000   4000   8000   6000   NA
 [3,]  14000   9000   5000  12000   NA
 [4,]   2000   2000   2000  -1000   NA
 [5,]  -9000  -7000  -8000  -8000   NA
 [6,]  14000  16000  14000  17000   NA
 [7,]   3000   1000  -2000  -3000   NA
 [8,]  -9000 -16000 -10000 -10000   NA
 [9,] -10000  -6000  -1000  -4000   NA
[10,]  -2000      0   1000   6000   NA
[11,]  -5000  -1000 -10000 -12000   NA
[12,]  -2000  -8000  -4000     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/1lvuo1476817715.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/24e4h1476817715.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/36lbs1476817715.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/47l3k1476817715.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,] 10000 13000 15000 29000 31000 22000 36000 36000 25000 19000 18000 13000
[2,] 10500 14000 17500 29000 31000 23000 37000 37000 25500 19500 18500 14500
[3,] 11000 15500 20500 29500 31500 24000 39000 38500 27000 22000 22500 17000
[4,] 11500 16500 23000 31500 32000 24000 40500 40000 29000 24500 28000 18000
[5,] 12000 17000 25000 33000 32000 24000 41000 41000 30000 25000 30000 18000

$n
 [1] 4 4 4 4 4 4 4 4 4 4 4 4

$conf
      [,1]  [,2]  [,3]  [,4]  [,5]  [,6]  [,7]  [,8]  [,9] [,10] [,11] [,12]
[1,] 10210 13525 16155 27525 30710 23210 36235 36130 24235 18050 14995 14235
[2,] 11790 17475 24845 31475 32290 24790 41765 40870 29765 25950 30005 19765

$out
numeric(0)

$group
numeric(0)

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

Warning message:
In bxp(list(stats = c(10000, 10500, 11000, 11500, 12000, 13000,  :
  some notches went outside hinges ('box'): maybe set notch=FALSE
> dev.off()
null device 
          1 
> postscript(file="/var/wessaorg/rcomp/tmp/5sawn1476817715.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,] 2000 2000  5000 -1000 -9000 14000 -3000 -16000 -10000 -2000 -12000 -8000
[2,] 2500 3000  7000   500 -8500 14000 -2500 -13000  -8000 -1000 -11000 -6000
[3,] 4000 5000 10500  2000 -8000 15000  -500 -10000  -5000   500  -7500 -4000
[4,] 6000 7000 13000  2000 -7500 16500  2000  -9500  -2500  3500  -3000 -3000
[5,] 7000 8000 14000  2000 -7000 17000  3000  -9000  -1000  6000  -1000 -2000

$n
 [1] 4 4 4 4 4 4 4 4 4 4 4 3

$conf
     [,1] [,2]  [,3] [,4]  [,5]  [,6]  [,7]   [,8]  [,9] [,10]  [,11]    [,12]
[1,] 1235 1840  5760  815 -8790 13025 -4055 -12765 -9345 -3055 -13820 -6736.64
[2,] 6765 8160 15240 3185 -7210 16975  3055  -7235  -655  4055  -1180 -1263.36

$out
numeric(0)

$group
numeric(0)

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

Warning message:
In bxp(list(stats = c(2000, 2500, 4000, 6000, 7000, 2000, 3000,  :
  some notches went outside hinges ('box'): maybe set notch=FALSE
> dev.off()
null device 
          1 
> postscript(file="/var/wessaorg/rcomp/tmp/6ozp91476817715.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]  [,3]  [,4] [,5]
[1,] 11000 11000 10000 12000   NA
[2,] 14000 18500 20500 19500   NA
[3,] 21000 22000 25500 26000   NA
[4,] 30500 30000 31000 32500   NA
[5,] 39000 41000 38000 41000   NA

$n
[1] 12 12 12 12  0

$conf
         [,1]     [,2]     [,3]     [,4] [,5]
[1,] 13474.24 16754.77 20710.88 20070.61   NA
[2,] 28525.76 27245.23 30289.12 31929.39   NA

$out
numeric(0)

$group
numeric(0)

$names
[1] "1" "2" "3" "4" NA 

Warning message:
In bxp(list(stats = c(11000, 14000, 21000, 30500, 39000, 11000,  :
  some notches went outside hinges ('box'): maybe set notch=FALSE
> dev.off()
null device 
          1 
> postscript(file="/var/wessaorg/rcomp/tmp/7xsjd1476817715.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,] 11000 11000 11000.0
[2,] 18250 18750 18500.0
[3,] 23375 23250 23312.5
[4,] 30875 30500 30687.5
[5,] 38750 39000 38875.0

$n
[1] 12 12 12

$conf
         [,1]     [,2]    [,3]
[1,] 17616.65 17890.75 17753.7
[2,] 29133.35 28609.25 28871.3

$out
numeric(0)

$group
numeric(0)

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

Warning message:
In bxp(list(stats = c(11000, 18250, 23375, 30875, 38750, 11000,  :
  some notches went outside hinges ('box'): maybe set notch=FALSE
> dev.off()
null device 
          1 
> 
> try(system("convert tmp/1lvuo1476817715.ps tmp/1lvuo1476817715.png",intern=TRUE))
character(0)
> try(system("convert tmp/24e4h1476817715.ps tmp/24e4h1476817715.png",intern=TRUE))
character(0)
> try(system("convert tmp/36lbs1476817715.ps tmp/36lbs1476817715.png",intern=TRUE))
character(0)
> try(system("convert tmp/47l3k1476817715.ps tmp/47l3k1476817715.png",intern=TRUE))
character(0)
> try(system("convert tmp/5sawn1476817715.ps tmp/5sawn1476817715.png",intern=TRUE))
character(0)
> try(system("convert tmp/6ozp91476817715.ps tmp/6ozp91476817715.png",intern=TRUE))
character(0)
> try(system("convert tmp/7xsjd1476817715.ps tmp/7xsjd1476817715.png",intern=TRUE))
character(0)
> 
> 
> proc.time()
   user  system elapsed 
  2.449   0.155   2.646