R version 2.15.2 (2012-10-26) -- "Trick or Treat"
Copyright (C) 2012 The R Foundation for Statistical Computing
ISBN 3-900051-07-0
Platform: i686-pc-linux-gnu (32-bit)

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> par4 = '0.05'
> par3 = '13'
> par2 = '13,78'
> par1 = '63'
> par4 <- '0.05'
> par3 <- '13'
> par2 <- '13,78'
> par1 <- '63'
> #'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!)
> par1<-as.numeric(par1)
> par2<-as.numeric(par2)
Warning message:
NAs introduced by coercion 
> par3<-as.numeric(par3)
> par4<-as.numeric(par4)
> df <- par1 - 1
> myc <- df * par2 / par3
> myc
[1] NA
> if (par2 > par3)
+ {
+ myp <- 1 - pchisq(myc,df)
+ } else {
+ myp <- pchisq(myc,df)
+ }
Error in if (par2 > par3) { : missing value where TRUE/FALSE needed
Execution halted