How can I create all possible random combinations of word pairs without having the same values (for example, house - house)?

Hi all. I have this code:

Tile = {'house', 'core', 'word', 'ask', 'question', 'horse', 'phone', 'eyes', 'hair', 'man'};

idx = randi(10, 90, 2)

j = 1;

k = 1;

if ~isequal(j,k)

k = k + 1;

idx = randperm(10, 90, 2);

end

end

disp(j)

disp(k)

disp(Tile(idx))

Answer 1

[Stephen23]

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'

[Martha Spadaccino]

Thank you so much, but I want a random combinations. This is in order..

[Stephen23]

"..but I want a random combinations. This is in order.."

Just randomize the rows of X to get the pairs in a random order:

>> X = X(randperm(size(X,1)),:);
>> 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'

[Martha Spadaccino]

Done, but if I try to run the code, I have this error: "Function ''subsindex' is not defined for values of class cell"

[Stephen23]

@Martha Spadaccino: please show the exact code that you are running.

[Martha Spadaccino]

@Stephen Cobeldick

>> Tile = {'house', 'core', 'word', 'ask', 'question', 'horse', 'phone', 'eyes', 'hair', 'man'};

>> X = X(randperm(size(X,1)),:);

>> 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'

Answer 2

[Martha Spadaccino]

@Stephen Cobeldick

>> Tile = {'house', 'core', 'word', 'ask', 'question', 'horse', 'phone', 'eyes', 'hair', 'man'};

>> X = X(randperm(size(X,1)),:);

>> Tile(X)

>> "Function ''subsindex' is not defined for values of class cell"