Hello
I have a vector a =(-2,0,0,0,1,0,0,3,0,0,-4)
I want to replace all zeros into previous non-zero state. So for instance the
above vector should be converted into:
a= (-2,-2,-2,-2,1,1,1,3,3,3,-4)
I tried many things and finally concluded that probably(?) rollapply may be the
best way?
I tried
f= function(x){
ifelse(x==0,Lag(x),x)
}
And then, rollappy(a,1,f) and that didn't work. Can someone help please?
Thx
R
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