MATLAB: Finding indexes of duplicate words in an array

index indexing matlab array

Hello, how would I go about finding the indexes of repeated words in an array.

k = ['dog' 'cat' 'dog' 'lion' 'tiger'];

How would I find the indexes where dog is located?

Thanks!

Best Answer

k = {'dog' 'cat' 'dog' 'lion' 'tiger'};
[uniquewords, ~, idx] = unique(k);

Now all the places where idx == 1 are places where uniquewords{1} occurred (it will be 'cat'), all the places where idx == 2 are places where uniquewords{2} occurred (it will be 'dog') and so on.

If you know the word you are looking for, then you can use

find(strcmp('dog',k))

Related Solutions

MATLAB: How to summarize this code

You can try to create structure for the data of different years:

for i = 1:length(precips)
    precip.(['y',num2str(i+1981)]) = precips{i,1};
end

Now, if you want to access data with any specific year say 2000. You can just type:

Req_data = precip.y2000;

I hope it helps!

MATLAB: How to create all possible random combinations of word pairs without having the same values (for example, house – house)

Pick random rows from X to get the random pairs:

>> Tile = {'house', 'core', 'word', 'ask', 'question', 'horse', 'phone', 'eyes', 'hair', 'man'};
>> X = nchoosek(1:numel(Tile),2); % sorted row order.
>> Tile(X)
ans = 
    'house'       'core'    
    'house'       'word'    
    'house'       'ask'     
    'house'       'question'
    'house'       'horse'   
    'house'       'phone'   
    'house'       'eyes'    
    'house'       'hair'    
    'house'       'man'     
    'core'        'word'    
    'core'        'ask'     
    'core'        'question'
    'core'        'horse'   
    'core'        'phone'   
    'core'        'eyes'    
    'core'        'hair'    
    'core'        'man'     
    'word'        'ask'     
    'word'        'question'
    'word'        'horse'   
    'word'        'phone'   
    'word'        'eyes'    
    'word'        'hair'    
    'word'        'man'     
    'ask'         'question'
    'ask'         'horse'   
    'ask'         'phone'   
    'ask'         'eyes'    
    'ask'         'hair'    
    'ask'         'man'     
    'question'    'horse'   
    'question'    'phone'   
    'question'    'eyes'    
    'question'    'hair'    
    'question'    'man'     
    'horse'       'phone'   
    'horse'       'eyes'    
    'horse'       'hair'    
    'horse'       'man'     
    'phone'       'eyes'    
    'phone'       'hair'    
    'phone'       'man'     
    'eyes'        'hair'    
    'eyes'        'man'     
    'hair'        'man'     
>> X = X(randperm(size(X,1)),:); % random row order.
>> Tile(X)
ans = 
    'core'        'word'    
    'horse'       'hair'    
    'house'       'phone'   
    'eyes'        'man'     
    'house'       'question'
    'horse'       'phone'   
    'question'    'horse'   
    'horse'       'eyes'    
    'horse'       'man'     
    'question'    'hair'    
    'house'       'word'    
    'question'    'phone'   
    'core'        'hair'    
    'phone'       'hair'    
    'ask'         'question'
    'house'       'eyes'    
    'word'        'eyes'    
    'eyes'        'hair'    
    'phone'       'eyes'    
    'core'        'phone'   
    'core'        'eyes'    
    'question'    'eyes'    
    'core'        'horse'   
    'core'        'man'     
    'word'        'ask'     
    'word'        'man'     
    'house'       'core'    
    'ask'         'eyes'    
    'ask'         'man'     
    'ask'         'hair'    
    'house'       'hair'    
    'word'        'phone'   
    'house'       'horse'   
    'house'       'ask'     
    'core'        'question'
    'house'       'man'     
    'word'        'horse'   
    'word'        'hair'    
    'word'        'question'
    'question'    'man'     
    'ask'         'phone'   
    'hair'        'man'     
    'phone'       'man'     
    'core'        'ask'     
    'ask'         'horse'

Best Answer

Related Solutions

MATLAB: How to summarize this code

MATLAB: How to create all possible random combinations of word pairs without having the same values (for example, house – house)

Related Question