[R] element wise conditional assignment in r

[yunjiangster]

Hi,
  I am looking for a one-liner code for the following situation
say I have a vector r of 0 and 1's, and another vector v of equal length. I
want to assign v[i]-1 to v[i] if r[i]=1, for all i. How would I do that
using mapply or any other batch processing keywords? thanks.

  John
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