[R] conditional replacement of contiguous values

[andrewjt]

Hello,
I need help getting from data$HAVE to data$NEED (see below). This requires
replacing every TRUE in data$HAVE with 4 TRUE(s) in data$NEED. 

Any ideas? It seems straight forward but I can't figure it out!
Thanks in advance


  HAVE             NEED

1  FALSE          FALSE
2  FALSE          FALSE
3  TRUE           TRUE
4  FALSE          TRUE
5  FALSE          TRUE
6  FALSE          TRUE
7  FALSE          FALSE
8  FALSE          FALSE
9  FALSE          FALSE
10 TRUE          TRUE
11 FALSE         TRUE
12 FALSE         TRUE 
13 FALSE         TRUE
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