[R] debug in a loop

[ikuzar]

Hi, 

I'd like to debug in a loop (using debug() and browser() etc but not print()
). I'am looking for the first occurence of NA.
For instance:

tab = c(1:300)
tab[250] = NA
len = length(tab)
for (i in 1:len){
   if(i != len){
     tab[i] = tab[i]+tab[i+1]
   }
}

I do not want to do "Browse[2]> n" for each step ... I'd like to declare a
"browser()" in the loop with a condition. But how to write "stop running
when you encounter NA" ?

Thanks for your help

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