R version 2.13.0 (2011-04-13)
Copyright (C) 2011 The R Foundation for Statistical Computing
ISBN 3-900051-07-0
Platform: i486-pc-linux-gnu (32-bit)

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> x <- array(list(50
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+ ,dim=c(4
+ ,180)
+ ,dimnames=list(c('h'
+ ,'w'
+ ,'rh'
+ ,'rw')
+ ,1:180))
>  y <- array(NA,dim=c(4,180),dimnames=list(c('h','w','rh','rw'),1:180))
>  for (i in 1:dim(x)[1])
+  {
+  	for (j in 1:dim(x)[2])
+  	{
+  		y[i,j] <- as.numeric(x[i,j])
+  	}
+  }
> par5 = '2'
> par4 = '1'
> par3 = '0'
> par2 = 'TRUE'
> par1 = '3'
> ylab = 'Exam Score'
> xlab = 'Placement'
> main = 'Reddy-Moores Placement Data'
> par5 <- '2'
> par4 <- '1'
> par3 <- '0'
> par2 <- 'TRUE'
> par1 <- '3'
> #'GNU S' R Code compiled by R2WASP v. 1.0.44 ()
> #Author: Dr. Ian E. Holliday
> #To cite this work: Ian E. Holliday, 2009, YOUR SOFTWARE TITLE (vNUMBER) in Free Statistics Software (v$_version), Office for Research Development and Education, URL http://www.wessa.net/rwasp_YOURPAGE.wasp/
> #Source of accompanying publication: 
> #Technical description: 
> par1 <- as.numeric(par1) # colour
> par2<- as.logical(par2) # notches
> par3<-as.numeric(par3) # percentage trim
> if(par3>45){par3<-45;warning('trim limited to 45%')}
> if(par3<0){par3<-0;warning('negative trim makes no sense. Trim is zero.')}
> par4 <- as.numeric(par4) #factor column
> par5 <- as.numeric(par5) # response column
> x <- t(x)
> x1<-as.numeric(x[,par5]) # response
> f1<-as.character(x[,par4]) # factor
> x2<-x1[f1=='no']
> f2 <- f1[f1=='no']
> lotrm<-as.integer(length(x2)*par3/100)
> hitrm<-as.integer(length(x2)*(100-par3)/100)
> srt<-order(x2,f2)
> trmx1<-x2[srt[lotrm:hitrm]]
> trmf1<-f2[srt[lotrm:hitrm]]
> x3<-x1[f1=='yes']
> f3 <- f1[f1=='yes']
> lotrm<-as.integer(length(x3)*par3/100)
> hitrm<-as.integer(length(x3)*(100-par3)/100)
> srt<-order(x3,f3)
> trmx2<-x3[srt[lotrm:hitrm]]
> trmf2<-f3[srt[lotrm:hitrm]]
> xtrm<-c(trmx1,trmx2)
> ftrm<-c(trmf1,trmf2)
> xtrm[1:6]
[1] NA NA NA NA NA NA
> ftrm[1:6]
[1] NA NA NA NA NA NA
> postscript(file="/var/wessaorg/rcomp/tmp/1ay3x1338545341.ps",horizontal=F,onefile=F,pagecentre=F,paper="special",width=8.3333333333333,height=5.5555555555556) 
> r<-boxplot(xtrm~as.factor(ftrm), col=par1, notch=par2, main='Reddy and Moores Placements Data', xlab='Placement Student', ylab='Degree Grade')
Error in boxplot.default(split(mf[[response]], mf[-response]), ...) : 
  invalid first argument
Calls: boxplot -> boxplot.formula -> boxplot -> boxplot.default
In addition: Warning message:
In is.na(rows) : is.na() applied to non-(list or vector) of type 'NULL'
Execution halted