R version 3.3.1 (2016-06-21) -- "Bug in Your Hair"
Copyright (C) 2016 The R Foundation for Statistical Computing
Platform: x86_64-pc-linux-gnu (64-bit)

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> x <- c(30,32,24,38,36,26,25,26,16,12,15,21,33,32,24,41,38,28,24,30,18)
> 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] 21
> (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] 2 2 2 2 2 2 2 2 2 1 1 1
> arr
      [,1] [,2]
 [1,]   30   33
 [2,]   32   32
 [3,]   24   24
 [4,]   38   41
 [5,]   36   38
 [6,]   26   28
 [7,]   25   24
 [8,]   26   30
 [9,]   16   18
[10,]   12   NA
[11,]   15   NA
[12,]   21   NA
> darr
      [,1] [,2]
 [1,]    2   -1
 [2,]   -8   -8
 [3,]   14   17
 [4,]   -2   -3
 [5,]  -10  -10
 [6,]   -1   -4
 [7,]    1    6
 [8,]  -10  -12
 [9,]   -4   NA
[10,]    3   NA
[11,]    6   NA
[12,]   12   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/1mnyg1476375153.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/2xmac1476375153.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/37wc91476375153.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/4749p1476375153.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,] 30.0   32   24 38.0   36   26 24.0   26   16    12    15    21
[2,] 30.0   32   24 38.0   36   26 24.0   26   16    12    15    21
[3,] 31.5   32   24 39.5   37   27 24.5   28   17    12    15    21
[4,] 33.0   32   24 41.0   38   28 25.0   30   18    12    15    21
[5,] 33.0   32   24 41.0   38   28 25.0   30   18    12    15    21

$n
 [1] 2 2 2 2 2 2 2 2 2 1 1 1

$conf
         [,1] [,2] [,3]     [,4]     [,5]     [,6]     [,7]     [,8]     [,9]
[1,] 28.14831   32   24 36.14831 34.76554 24.76554 23.38277 23.53109 14.76554
[2,] 34.85169   32   24 42.85169 39.23446 29.23446 25.61723 32.46891 19.23446
     [,10] [,11] [,12]
[1,]    12    15    21
[2,]    12    15    21

$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(30, 30, 31.5, 33, 33, 32, 32, 32, 32, 32,  :
  some notches went outside hinges ('box'): maybe set notch=FALSE
> dev.off()
null device 
          1 
> postscript(file="/var/wessaorg/rcomp/tmp/52nq21476375153.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,] -1.0   -8 14.0 -3.0  -10 -4.0  1.0  -12   -4     3     6    12
[2,] -1.0   -8 14.0 -3.0  -10 -4.0  1.0  -12   -4     3     6    12
[3,]  0.5   -8 15.5 -2.5  -10 -2.5  3.5  -11   -4     3     6    12
[4,]  2.0   -8 17.0 -2.0  -10 -1.0  6.0  -10   -4     3     6    12
[5,]  2.0   -8 17.0 -2.0  -10 -1.0  6.0  -10   -4     3     6    12

$n
 [1] 2 2 2 2 2 2 2 2 1 1 1 1

$conf
          [,1] [,2]     [,3]      [,4] [,5]       [,6]      [,7]       [,8]
[1,] -2.851686   -8 12.14831 -3.617229  -10 -5.8516861 -2.086144 -13.234457
[2,]  3.851686   -8 18.85169 -1.382771  -10  0.8516861  9.086144  -8.765543
     [,9] [,10] [,11] [,12]
[1,]   -4     3     6    12
[2,]   -4     3     6    12

$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(-1, -1, 0.5, 2, 2, -8, -8, -8, -8, -8, 14,  :
  some notches went outside hinges ('box'): maybe set notch=FALSE
> dev.off()
null device 
          1 
> postscript(file="/var/wessaorg/rcomp/tmp/6pfq61476375153.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,] 12.0   18
[2,] 18.5   24
[3,] 25.5   30
[4,] 31.0   33
[5,] 38.0   41

$n
[1] 12  9

$conf
         [,1]  [,2]
[1,] 19.79867 25.26
[2,] 31.20133 34.74

$out
numeric(0)

$group
numeric(0)

$names
[1] "1" NA 

Warning message:
In bxp(list(stats = c(12, 18.5, 25.5, 31, 38, 18, 24, 30, 33, 41 :
  some notches went outside hinges ('box'): maybe set notch=FALSE
> dev.off()
null device 
          1 
> postscript(file="/var/wessaorg/rcomp/tmp/7usnz1476375153.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,] 12.00 12.00 12.00
[2,] 19.00 19.00 19.00
[3,] 25.75 25.75 25.75
[4,] 31.75 31.75 31.75
[5,] 39.50 39.50 39.50

$n
[1] 12 12 12

$conf
         [,1]     [,2]     [,3]
[1,] 19.93464 19.93464 19.93464
[2,] 31.56536 31.56536 31.56536

$out
numeric(0)

$group
numeric(0)

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

> dev.off()
null device 
          1 
> 
> try(system("convert tmp/1mnyg1476375153.ps tmp/1mnyg1476375153.png",intern=TRUE))
character(0)
> try(system("convert tmp/2xmac1476375153.ps tmp/2xmac1476375153.png",intern=TRUE))
character(0)
> try(system("convert tmp/37wc91476375153.ps tmp/37wc91476375153.png",intern=TRUE))
character(0)
> try(system("convert tmp/4749p1476375153.ps tmp/4749p1476375153.png",intern=TRUE))
character(0)
> try(system("convert tmp/52nq21476375153.ps tmp/52nq21476375153.png",intern=TRUE))
character(0)
> try(system("convert tmp/6pfq61476375153.ps tmp/6pfq61476375153.png",intern=TRUE))
character(0)
> try(system("convert tmp/7usnz1476375153.ps tmp/7usnz1476375153.png",intern=TRUE))
character(0)
> 
> 
> proc.time()
   user  system elapsed 
  2.536   0.202   2.790