Extract Previous Cell Value

I have a cell with char values next to each other as seen below

Cell 1 | Cell 2

____________

'Hello' | 'World'

I would like to define a function that extracts the previous cell value along with the current cell value. I wrote the following code to do so:

t = x{1,i} - Current Cell Value

f = x{2,i-1} - Previous Cell Value, starting with Cell 2 with the previous value of Cell 1

But I keep getting the error

Index in position 2 is invalid. Array indices must be positive integers or logical values.

I believe the error is with regards to the defined function f. It has to do with the i-1 value. At this point, I am stuck. Any thoughts on how to fix that so it works?

Answer 1

[TADA]

The problem is you're indexing at index 0 which is invalid.

% some specific handling of
% the first cell should be
% executed here if necessary

for i = 2:size(x,2)
  t = x{1,i};
  f = x{2,i-1};
end

[Jeffrey Pang]

Its now telling me

Index exceeds array bounds.

[TADA]

I'll have to see your code and an example of the data to know what's going on

[Jeffrey Pang]

I am trying to make a card game where you draw cards until you get 2 in a row (2 kings are drawn one after the other) . The feature I am trying to implement is to stop the code when two cards of the same type are drawn.

Code:

deck = {char('2 Spades'), char('2 Hearts'), char('2 Clubs'), char('2 Diamonds'), char('3 Spades'), char('3 Hearts'), char('3 Clubs'), char('3 Diamonds'), char('4 Spades'), char('4 Hearts'), char('4 Clubs'), char('4 Diamonds') , char('5 Spades'), char('5 Hearts'), char('5 Clubs'), char('5 Diamonds'), char('6 Spades'), char('6 Hearts'), char('6 Clubs'), char('6 Diamonds'), char('7 Spades'), char('7 Hearts'), char('7 Clubs'), char('7 Diamonds'), char('8 Spades'), char('8 Hearts'), char('8 Clubs'), char('8 Diamonds'), char('9 Spades'), char('9 Hearts'), char('9 Clubs'), char('9 Diamonds'), char('10 Spades'), char('10 Hearts'), char('10 Clubs'), char('10 Diamonds'), char('K Spades'), char('K Hearts'), char('K Clubs'), char('K Diamonds'), char('J Spades'), char('J Hearts'), char('J Clubs'), char('J Diamonds'), char('Q Spades'), char('Q Hearts'), char('Q Clubs'), char('Q Diamonds'), char('A Spades'), char('A Hearts'), char('A Clubs'), char('A Diamonds')};

x = randsample(deck, 52, false);

for i = 1:52;

pause(1)

disp(x{1,i});

for j = 2:size(x,2)

t = x{1,j};

f = x{2,j-1};

end

if t(1) == f(1)

pause

end

reshape([deck],1,[]);

end

[TADA]

This is your problem

f = x{2,j-1};

As x is a one dimentional row cell array

This should work I think:

for i = 1:52
  disp(x{1,i});
  t = x{1,i}; 
  f = x{1,i-1}; 

    if t(1) == f(1)
       break;
    end
  end

[Jeffrey Pang]

I got it. Thank you for putting me on the right track!

[TADA]

Cheers

Good luck