Review
You've covered a lot of stringr functions in this chapter:
As a review we've got a few tasks for you to do with some DNA sequences. We've put three sequences, corresponding to three genes, from the genome of Yersinia pestis – the bacteria that causes bubonic plague – into the vector genes.
Each string represents a gene, each character a particular nucleotide: Adenine, Cytosine, Guanine or Thymine.
We aren't going to tell you which function to use. It's up to you to choose the right one and specify the needed arguments. Good luck!
이 연습은 강의의 일부입니다
String Manipulation with stringr in R
연습 안내
- Find the number of nucleotides in each gene.
- Find the number of
A's that occur in each gene. - Return the sequences that contain the sequence
"TTTTTT". - Replace all the
As in the sequences with a_.
실습형 인터랙티브 연습
이 예제를 이 샘플 코드를 완성하여 풀어보세요.
# Find the number of nucleotides in each sequence
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# Find the number of A's occur in each sequence
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# Return the sequences that contain "TTTTTT"
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# Replace all the "A"s in the sequences with a "_"
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