hi
thank you all for the great replies, very useful indeed even if some of them
a bit too aggressive (which is never, ever a good approach in my very humble
opinion... but that's a matter of taste and style I do not want to discuss
here); sorry again for bothering someone with such a trivial and
ill-conceived question
finally, I'm posting here my solution as a reference to the problem so that
to close this long and winding thread;
hoping this code might be somehow useful for someonelse, sometime,
somewhere...
## start code
v0<-c("a","xxx","c",rep("xxx",2))
v1<-c(1,"b",3,"d","e")
v2<-c(6,2,8,4,5)
v3<-c("xxx",7,"xxx",9,10)
df_start<-data.frame(v0,v1,v2,v3, stringsAsFactors = FALSE)
df_start
# set vector of rows to be shifted left
shIftLeft<-c(2,4,5)
# shift selected rows
df_start[shIftLeft,1:3]<-df_start[shIftLeft,2:4]
# final result
df_end<-df_start[,1:3]
df_end
## end code
thanks
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