You need brackets in i:(i+25)
3:3+25
is not want you
3:(3+25)
is what you want.
to explicitly print out values in a for loop you need to use print
for (i in 1:10) {
print(i)
}
Ole
Ole F. Christensen Center for Bioinformatik Aarhus Universitet Ny Munkegade, Bygning 540 8000 Aarhus C