R version 3.0.1 (2013-05-16) -- "Good Sport"
Copyright (C) 2013 The R Foundation for Statistical Computing
Platform: i686-pc-linux-gnu (32-bit)

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> x <- c(8.15,8.19,8.31,8.3,8.34,8.31,8.38,8.34,8.44,8.64,8.6,8.61,8.54,8.69,8.73,8.91,9.01,9.08,8.94,9.03,9.02,8.96,9.03,8.94,8.95,8.95,8.99,8.93,8.98,8.95,9.02,8.92,9.1,9.06,8.97,8.89,8.99,8.79,8.83,8.61,8.71,8.91,8.91,8.89,8.98,9,8.99,8.88,8.93,8.96,9.21,9.08,9.11,9.12,9.2,9.43,9.64,9.72,9.72,9.62)
> par4 = '12'
> par3 = 'Gemiddelde consumptieprijzen per product - alcoholhoudende dranken: bier'
> par2 = 'Belgostat'
> par1 = 'Gemiddelde consumptieprijzen per product - alcoholhoudende dranken: bier'
> ylimmax = as.numeric(Prijs)
Error: object 'Prijs' not found
Execution halted