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 <- c(23,20,20,21,24,22,23,20,25,23,27,27,22,24,25,22,28,28,27,25,16,28,21,24,27,14,14,27,20,21,22,21,12,20,24,19,28,23,27,22,27,26,22,21,19,24,19,26,22,28,21,23,28,10,24,21,21,24,24,25,25,23,21,16,17,25,24,23,25,23,28,26,22,19,26,18,18,25,27,12,15,21,23,22,21,24,27,22,28,26,10,19,22,21,24,25,21,20,21,24,23,18,24,24,19,20,18,20,27,23,26,23,17,21,25,23,27,24,20,27,21,24,21,15,25,25,22,24,21,22,23,22,20,23,25,23,22,25,26,22,24,24,25,20,26,21,26,21,22,16,26,28,18,25,23,21,20,25,22,21,16,18)
> par2 = '0'
> par1 = '8'
> ylab = 'density'
> xlab = 'value of data series'
> main = 'Histogram and Fitted Normal Density'
> library(MASS)
> par1 <- as.numeric(par1)
> if (par2 == '0') par2 = 'Sturges' else par2 <- as.numeric(par2)
> x <- as.ts(x) #otherwise the fitdistr function does not work properly
> r <- fitdistr(x,'normal')
> r
      mean          sd    
  22.3950617    3.6283486 
 ( 0.2850700) ( 0.2015749)
> postscript(file="/var/wessaorg/rcomp/tmp/1ibfp1318507663.ps",horizontal=F,onefile=F,pagecentre=F,paper="special",width=8.3333333333333,height=5.5555555555556) 
> myhist<-hist(x,col=par1,breaks=par2,main=main,ylab=ylab,xlab=xlab,freq=F)
> curve(1/(r$estimate[2]*sqrt(2*pi))*exp(-1/2*((x-r$estimate[1])/r$estimate[2])^2),min(x),max(x),add=T)
> dev.off()
null device 
          1 
> 
> #Note: the /var/wessaorg/rcomp/createtable file can be downloaded at http://www.wessa.net/cretab
> load(file="/var/wessaorg/rcomp/createtable")
> 
> a<-table.start()
> a<-table.row.start(a)
> a<-table.element(a,'Parameter',1,TRUE)
> a<-table.element(a,'Estimated Value',1,TRUE)
> a<-table.element(a,'Standard Deviation',1,TRUE)
> a<-table.row.end(a)
> a<-table.row.start(a)
> a<-table.element(a,'mean',header=TRUE)
> a<-table.element(a,r$estimate[1])
> a<-table.element(a,r$sd[1])
> a<-table.row.end(a)
> a<-table.row.start(a)
> a<-table.element(a,'standard deviation',header=TRUE)
> a<-table.element(a,r$estimate[2])
> a<-table.element(a,r$sd[2])
> a<-table.row.end(a)
> a<-table.end(a)
> table.save(a,file="/var/wessaorg/rcomp/tmp/25yxn1318507663.tab") 
> 
> try(system("convert tmp/1ibfp1318507663.ps tmp/1ibfp1318507663.png",intern=TRUE))
character(0)
> 
> 
> proc.time()
   user  system elapsed 
  0.517   0.105   0.614