Index exceeds array elements

I'm taking a class for matlab, so I apologize for messy or improper formatting. I've set to write a code for one of the assignments, but in my for loop, the loop index goes above the length of the vector even though that shouldn't be the case. I'm wondering why this is an issue. There was a given function gen_vector, but I do not see that as the issue.

function CodeBreaker = hw5__AA_func(n,d)
%%Given Guess Vector
guess_vector = gen_vector(6,4);
%% The Code that the "bot" must find out
code = guess_vector(randi(length(guess_vector)));
%%The first guess in the vector
guess = guess_vector(1);
%% True/False Vector used to remove incorrect guesses
TF = true(length(guess_vector));
%%Number of rounds
rounds = 1;
%%Number of Digits that match code
match = check_matches(guess,code);
while (guess ~= code & rounds <= 8)
    for (j = 1:length(guess_vector))
        %%Checking digits in every instance of the vector
        N_Match1 = check_matches(guess,guess_vector(j))
        %%if an index does not match the given match, then the
        %%corresponding value in TF is 0.
        if N_Match1 ~= match
            TF(j) = 0;
        else
            TF(j) = 1;
        end
        if TF(j) == 0
            %%If an index in TF is 0, then the corresponding index in the
            %%guess vector is removed, then the length of the new vector is
            %%reestablished as is the true/false vector
        guess_vector(j) = []
        guess_vector
        else 
        end
        end
    end
  %%New Guess
    guess = guess_vector(1);
    %%Increase number of rounds
    rounds = rounds + 1;
    %% True/false vector length equal to the new length
    TF = true(length(guess_vector));
end
function N_match = check_matches(n1,n2)
dig1 = dec2base(n1,10)-'0';
dig2 = dec2base(n2,10)-'0';
N_match = length(find(dig1 == dig2));
end

[KSSV]

What input did you try?

[Johnny Thai]

I didn't try any particular input, I just tried running the function and I got that error for j. Technically (6,4) is the used input.

Answer 1

[Alex Mcaulley]

The problem is in this line (you are changing the size of the array inside the loop):

guess_vector(j) = []

One option could be:

function CodeBreaker = hw5__AA_func(n,d)
%%Given Guess Vector
guess_vector = gen_vector(6,4);
%% The Code that the "bot" must find out
code = guess_vector(randi(length(guess_vector)));
%%The first guess in the vector
guess = guess_vector(1);
%% True/False Vector used to remove incorrect guesses
TF = true(length(guess_vector));
%%Number of rounds
rounds = 1;
%%Number of Digits that match code
match = check_matches(guess,code);
while (guess ~= code & rounds <= 8)
    toRemove = false(size(guess_vector)); %Change
    for (j = 1:length(guess_vector))
        %%Checking digits in every instance of the vector
        N_Match1 = check_matches(guess,guess_vector(j))
        %%if an index does not match the given match, then the
        %%corresponding value in TF is 0.
        if N_Match1 ~= match
            TF(j) = 0;
        else
            TF(j) = 1;
        end
        if TF(j) == 0
            %%If an index in TF is 0, then the corresponding index in the
            %%guess vector is removed, then the length of the new vector is
            %%reestablished as is the true/false vector
            toRemove(j) = true; %Change
        end
    end
    guess_vector(toRemove) = []; %Change
  %%New Guess
    guess = guess_vector(1);
    %%Increase number of rounds
    rounds = rounds + 1;
    %% True/false vector length equal to the new length
    TF = true(length(guess_vector));
end
function N_match = check_matches(n1,n2)
dig1 = dec2base(n1,10)-'0';
dig2 = dec2base(n2,10)-'0';
N_match = length(find(dig1 == dig2));
end

[Johnny Thai]

While that has removed the initial problem, the proposed solution creates the error "matrix index is out of range for deletion"

[Alex Mcaulley]

What value of guess_vector are you using?