I think the qdap package's termco (termo count) function will do what you want.
Read the specifics as spacing around the word matters.
library(qdap);
termco(DATA$state, 1:nrow(DATA), c("it"))
----------------------------------------
> Date: Fri, 8 Mar 2013 21:34:31 +0530
> From: sudipanal...@gmail.com
> To: r-help@r-project.org
> Subject: [R] Word Frequency for each row
>
> Hi All,
>
> I am wondering if there is any examples where you can count your
> interested "word" in each row. For an example if you have data with *'ID*'
> and '*write-up*' for 100 rows, how would I calculate the word frequency for
> each row ?
>
> Thank you for all your time.
>
> [[alternative HTML version deleted]]
>
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