Dear R users:
Here's a barebones example of what I can't make work.
As you can see, regexpr() does not perform an exact string match, which only
occurs in row 1 of these data frames. Instead, as it's supposed to do, it
finds "b" in "bb" and "c" in "cc". Does anybody know what function I can use
such that only the first rows would be matched (ie, exact string match?)
I've also tried simply using the == operator, in which case i get the
error:"level sets of factors are different"
Thank you in advance,
B
> ## two toy data frames, containing character arrays
> D1=as.data.frame(c("a","b","c"))
> D2=as.data.frame(c("a","bb","cc"))
>
> ## loop through each comparing the strings in each row
> i=1 #counter
> while (regexpr(D1[i,1], D2[i,1]) == TRUE) {
+ cat("identical match on row #", i, "\n")
+ i=i+1
+ if (i>3) break
+ }
identical match on row # 1
identical match on row # 2
identical match on row # 3
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