How to Count occurrences?

Question

Cre'Shawn Dabney 2019-10-8

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/484282-how-to-count-occurrences

回答： Jan 2021-5-10

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!

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Cre'Shawn Dabney 2019-10-8

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

fprintf('Pattern count: %d\n',count);

Priyadharshini A.R 2021-5-10

Hello Dabney,

The loop must go on till n-m+1 so that it can traverse till last element in text

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Answer 1

Jan 2021-5-10

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https://ww2.mathworks.cn/matlabcentral/answers/484282-how-to-count-occurrences#answer_696590

t = 'tagtacagccagtagagttgattccaaggaagtccggctgttgtagagtagc';
tag = 'tag';
result = sum(strfind(lower(t), lower(tag)))

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Answer 2

Alaster Meehan 2019-10-8

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/484282-how-to-count-occurrences#answer_395391

strcmpi ignors case

Cheers Alaster

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Cre'Shawn Dabney 2019-10-8

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!

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