这是一个DNA字符串,我想拆分,然后三人一组合并
dna=c("TACACGATGACAGTCTTGACGGGTTCTCCTACT")
dna.sg = unlist(strsplit(dna, ""))
给予
[1] "T" "A" "C" "A" "C" "G" "A" "T" "G" "A" "C" "A" "G" "T" "C" "T" "T" "G" "A" "C" "G" "G" "G" "T" "T" "C" "T" "C" "C" "T" "A" "C" "T"
但我想
"TAC" "ACG" [...]