示例#1
0
func main() {

	flag.Parse()

	// Now really print out the connected components
	seqtype := alphabet.DNA

	f1, err := os.Open(*in)
	if err != nil {
		fmt.Fprintf(os.Stderr, "Error: %v.\n", err)
		os.Exit(1)
	}
	defer f1.Close()

	f2, err := os.Create(*out)
	if err != nil {
		fmt.Fprintf(os.Stderr, "Error: %v.\n", err)
		os.Exit(1)
	}
	defer f2.Close()

	fastaSeqs := fasta.NewReader(f1, linear.NewSeq("", nil, seqtype))
	fastaOut := fasta.NewWriter(f2, 80)

	rand.Seed(time.Now().UnixNano())
	list := rand.Perm(*total)
	keep := make(map[int]bool)

	for i := 0; i < *numkeep; i++ {
		keep[list[i]] = true
	}

	counter := 0

	for true {
		seq, e := fastaSeqs.Read()
		if e != nil {
			break
		}

		if keep[counter] {
			fastaOut.Write(seq)
		}

		counter++
	}

	fmt.Fprintf(os.Stderr, "Done.\n")

}
示例#2
0
文件: gff.go 项目: frogs/biogo
// Write meta data to a GFF file.
func (self *Writer) WriteMetaData(d interface{}) (n int, err error) {
	switch d.(type) {
	case []byte, string:
		n, err = self.w.WriteString("##" + d.(string) + "\n")
	case *seq.Seq:
		sw := fasta.NewWriter(self.f, self.Width)
		sw.IDPrefix = []byte(fmt.Sprintf("##%s ", d.(*seq.Seq).Moltype))
		sw.SeqPrefix = []byte("##")
		n, err = sw.Write(d.(*seq.Seq))
		if err != nil {
			return
		}
		err = sw.Flush()
		if err != nil {
			return
		}
		var m int
		m, err = self.w.WriteString("##end-" + d.(*seq.Seq).Moltype.String() + "\n")
		n += m
		if err != nil {
			return
		}
		err = self.w.Flush()
		return
	case *feat.Feature:
		start := d.(*feat.Feature).Start
		if self.OneBased && start >= 0 {
			start++
		}
		n, err = self.w.WriteString("##sequence-region " + string(d.(*feat.Feature).ID) + " " +
			strconv.Itoa(start) + " " +
			strconv.Itoa(d.(*feat.Feature).End) + "\n")
	default:
		n, err = 0, bio.NewError("Unknown meta data type", 0, d)
	}

	if err == nil {
		err = self.w.Flush()
	}

	return
}