[R] conditional data replace (recode, change or whatsoever)

[zcatav]

Hello,
I have a big data.frame, a piece of it as follows.

 	a	        b		        c	    d
1	58009	2010-11-02	0	    NA
2	114761	NA		        1	    2008-11-05
3	184440	NA		        1	    2009-12-08
4	189372	NA		        0	    NA
5	105286	NA		        0	    NA
6	186717	NA		        0	    NA
7	189106	NA		        0	    NA
8	127306	NA		        0	    NA
9	157342	2011-04-25	0	    NA

I want to replace b[NA] values with "20011-07-28" where c==0. I use rstudio
and i'm a novice.


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