R version 2.8.0 (2008-10-20)
Copyright (C) 2008 The R Foundation for Statistical Computing
ISBN 3-900051-07-0

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> y <- c(36.68,36.7,36.71,36.72,36.73,36.73,36.87,37.31,37.39,37.42,37.51,37.67,37.67,37.71,37.78,37.79,37.84,37.88,38.34,38.58,38.72,38.83,38.9,38.92,38.94,39.1,39.14,39.16,39.32,39.34,39.44,39.92,40.19,40.2,40.27,40.28,40.3,40.34,40.4,40.43,40.48,40.48,40.63,40.74,40.77,40.91,40.92,41.03,41,41.04,41.33,41.44,41.46,41.55,41.55,41.81,41.78,41.84,41.84,41.86)
> x <- c(34.97,34.97,34.93,34.92,34.97,34.97,34.97,35.38,35.64,35.9,36.01,36.03,36.04,36.06,36.09,36.15,36.15,36.15,36.1,36.38,36.89,37,37.09,37.13,37.24,37.29,37.34,37.49,37.49,37.54,37.67,38.13,38.68,38.77,39,39.03,39.03,39.04,39.16,39.23,39.26,39.25,39.41,39.56,39.69,39.87,39.83,39.84,39.85,39.91,40.62,40.73,40.86,40.89,40.9,41.15,41.24,41.24,41.33,41.36)
> par5 = 'Uurtarief loodgieter'
> par4 = 'Uurtarief elektricien'
> par3 = 'TRUE'
> par2 = 'blue'
> par1 = 'red'
> ylab = ''
> main = 'Back to Back Histogram'
> #'GNU S' R Code compiled by R2WASP v. 1.0.44 ()
> #Author: Prof. Dr. P. Wessa
> #To cite this work: AUTHOR(S), (YEAR), 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: Office for Research, Development, and Education
> #Technical description: Write here your technical program description (don't use hard returns!)
> if (par3 == 'TRUE') par3 <- TRUE
> if (par3 == 'FALSE') par3 <- FALSE
> library(Hmisc)

Attaching package: 'Hmisc'


	The following object(s) are masked from package:base :

	 format.pval,
	 round.POSIXt,
	 trunc.POSIXt,
	 units 

> z <- data.frame(cbind(x,y))
> names(z) <- list(par4,par5)
> postscript(file="/var/www/html/freestat/rcomp/tmp/1bbuf1257694017.ps",horizontal=F,pagecentre=F,paper="special",width=8.3333333333333,height=5.5555555555556) 
> out <- histbackback(z, probability=par3, main = main, ylab = ylab)
> barplot(-out$left, col=par1, horiz=TRUE, space=0, add=TRUE, axes=FALSE)
> barplot(out$right, col=par2, horiz=TRUE, space=0, add=TRUE, axes=FALSE)
> dev.off()
null device 
          1 
> 
> system("convert tmp/1bbuf1257694017.ps tmp/1bbuf1257694017.png")
> 
> 
> proc.time()
   user  system elapsed 
  0.893   0.231   1.094