
Dear R community,
 
I wrote a small program using for loop but it does not make cycles. 
 
My data: Dataframes: a2, a1, b0 and b1. Vector: d
 
I would like to get b1 for each of i., i.e. totally 11. However, the program gives me b1 only for the last i =11.
 
d<-as.vector(levels(a2$combin2))
for (i in 1:11){
a1<-a2[a2$combin2%in%d[i],]
b1<-b0[b0$Date%in%(a1$Date),]
}
  
Your help is appreciated. Maybe someone could also recommend me good literature on for loops in R?
 
Thanks,
Julia
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