Database System Concepts
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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Can you give the hints of doing this exercise. If able can you show the steps? Also can you clarify the flow of doing the exercise. Thank you very much for the great help

def search all occurrences (seq, pattern):
res = []
for i in range (len (seq) -len (pattern) +1) :
if pattern == seq[i:i+len (pattern)]:
res.append(i)
return res
seqDNA = "ATAGAATAGATAATAGTC"
print (search_first_occ (seqDNA, "GAAT") )
print search_first_occ (seqDNA, "TATA") )
print search_all_occurrences (seqDNA "AAT") )
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Transcribed Image Text:def search all occurrences (seq, pattern): res = [] for i in range (len (seq) -len (pattern) +1) : if pattern == seq[i:i+len (pattern)]: res.append(i) return res seqDNA = "ATAGAATAGATAATAGTC" print (search_first_occ (seqDNA, "GAAT") ) print search_first_occ (seqDNA, "TATA") ) print search_all_occurrences (seqDNA "AAT") )
Take Home exercise
Write a function that, given a sequence as an argument, allows to detect if there are repeated
sub-sequences of size k (the second argument of the function). The result should be a dictionary
where keys are sub-sequences and values are the number of times they occur (at least 2). The
function template is given to you as below. (Hints: you can make use of the function
"search_all_occurrences" shown to you in Lecture 6)
def number_of_repeated_subseq
(seq, k):
"""Return a dictionary where keys are sub-sequences of size k and
values are number of times they occur (at least 2)"ww
dic = {}
# To be completed...
return dic
1
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Transcribed Image Text:Take Home exercise Write a function that, given a sequence as an argument, allows to detect if there are repeated sub-sequences of size k (the second argument of the function). The result should be a dictionary where keys are sub-sequences and values are the number of times they occur (at least 2). The function template is given to you as below. (Hints: you can make use of the function "search_all_occurrences" shown to you in Lecture 6) def number_of_repeated_subseq (seq, k): """Return a dictionary where keys are sub-sequences of size k and values are number of times they occur (at least 2)"ww dic = {} # To be completed... return dic 1
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