How to find longest sequennce within a character array?

lets say Im given a random character array such as: 'aaabee' and i want to find the longest sequence of vowels. How would i go about doing this?

so far I have:

cArr = 'aaabee';

vow = ['a', 'e', 'i', 'o', 'u'];

ans = strfind(cArr, vow);

but this just returns: [ ]

anyhelp would be appreciated!

Answer 1

[Ameer Hamza]

You can use regexp

cArr = 'xzyhd';
vow = '([aeiou]+)';
tkns = regexp(cArr, vow, 'tokens');
if isempty(tkns)
    n = 0;
else
    n = max(cellfun(@numel, [tkns{:}]));
end

Result

>> n
n =
     5

[Setsuna Yuuki.]

Awesome!

[That Guy]

this works, i just need it to output zero when a string without vowels is entered such as 'xzyhd' or ' ' .

sorry im so helpless this is my first experince with coding:(

[Ameer Hamza]

I have updated the answer. Now it will output 0 for the mentioned cases.

Answer 2

[Setsuna Yuuki.]

cArr = 'aaabee';
vow = ['a', 'e', 'i', 'o', 'u'];

for n=1:length(vow)
    a = strfind(cArr, vow(n)); %search letter by letter
    repeat{n} = a; %place in "cArr"
    if (a ~= NaN)
    long(n) = length(a); %number of repetitions
    else
    long(n) = 0;
    end
end

t =  table(vow',long')

Table:

[That Guy]

Thanks! any hints on how to modify what you have to not be as specific? I need it to find the longest sequence of any vowels ie: 'aaeeaprii' would return a max value of 5 within long(n), right now your code returns 3 instead?

[That Guy]

Any help?

[Setsuna Yuuki.]

has been interesting this problem, i changed all code because I understood bad your problem.

clear large;
cArr = 'aaeeaaapriioaeaaa';
vow = ['a', 'e', 'i', 'o', 'u'];
var = 1;
for n=1:length(vow)
    a = strfind(cArr, vow(n));     
    if(var == 1)
    var(length(var):(length(var)+length(a))-1)=a;
    else 
    var(length(var)+1:length(var)+length(a))=a;
    end
end

var =  sort(var); m = 0; 
cont = 1; 
for n = 1:length(var)-1
   if(var(n) == (var(n+1)-1) &&  n ~= length(var)-1)
    cont = cont +1;
   elseif (var(n) ~= (var(n+1)-1)) 
    m = m+1;
    large(m) = cont;
    cont = 1;
   elseif(n == (length(var)-1))
    cont = cont+1;
    m = m+1;
    large(m) = cont;
   end
end

[longSeq, index] = max(large);
fprintf("The longest sequence is %i and is the sequence %i \n",longSeq, index); 

I think I did this in C ++ jaja xd

[Image Analyst]

What's the use case for this quirky thing? Why do you need to do it? It's not your homework you're asking people to do for you, is it? What's the real world use for this?