How to Count occurrences?

조회 수: 9 (최근 30일)
Cre'Shawn Dabney
Cre'Shawn Dabney 2019년 10월 8일
답변: Jan 2021년 5월 10일
Given a text: ‘tagtacagccagtagagttgattccaaggaagtccggctgttgtagagtagc’ and a three-character target pattern (for example: ‘TAG’ ), your program should identify all target patterns in the text and output the number of occurrences of the target pattern.
Sample output Text:tagtacagccagtagagttgattccaaggaagtccggctgttgtagagtagctag
Target:TAG
Number of TAG:5
Target:tag
Number of tag:5
Target:GTa
Number of cag:2
Target:exit Program terminated!
  댓글 수: 3
Cre'Shawn Dabney
Cre'Shawn Dabney 2019년 10월 8일
Hello, I am confused about the looping and case sensitivity part. In other words I can perform the first output which is
Text:tagtacagccagtagagttgattccaaggaagtccggctgttgtagagtagctag
Target:TAG
Number of TAG:5
But I cant seem to produce the rest of the outputs. This is what I used to produce the first output:
clear;clc;
text=input('Enter text:','s');
pattern=input('Target:','s');
count=0;
n=size(text,2);
m=size(pattern,2);
for i=1:n-m
%sunstring find
temp=text(i:i+m-1);
%comapre
if(strcmp(temp,pattern))
count=count+1;
end
end
fprintf('Pattern count: %d\n',count);
Priyadharshini A.R
Priyadharshini A.R 2021년 5월 10일
Hello Dabney,
The loop must go on till n-m+1 so that it can traverse till last element in text

댓글을 달려면 로그인하십시오.

답변 (2개)

Jan
Jan 2021년 5월 10일
t = 'tagtacagccagtagagttgattccaaggaagtccggctgttgtagagtagc';
tag = 'tag';
result = sum(strfind(lower(t), lower(tag)))

Alaster Meehan
Alaster Meehan 2019년 10월 8일
strcmpi ignors case
Cheers Alaster
  댓글 수: 1
Cre'Shawn Dabney
Cre'Shawn Dabney 2019년 10월 8일
Thank you for your answer. I am still confused on how to write this code. Could you possibly demonstrate how? If not thank you so much for your participation!

댓글을 달려면 로그인하십시오.

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by