charcters saved as ASCII in matrix

I have a function that works fine

function threeinarow=isWinner(A,s)

count=0;

threeinarow='false';

for i=1:size(A,1)

      for j=1:size(A,2)

      if strcmp(A(i,j),s)

          count=count+1;

          if count==size(A,2)

               threeinarow='true'

          end

      end

      end

      count=0; 
  end

for i=1:size(A,1)

      for j=1:size(A,2)

      if strcmp(A(j,i),s)

          count=count+1;

          if count==size(A,1)

              threeinarow='true'

          end

      end

      end

       count=0;

end

i=1;

      for j=1:size(A,2)

      if strcmp(A(j,i),s)

          count=count+1;

          if count==size(A,1)

               threeinarow='true'

          end

           i=i+1;

      end

      end

       count=0;

      i=size(A,1);

      for j=1:size(A,2)

      if strcmp(A(j,i),s)

          count=count+1;

          if count==size(A,1)

              threeinarow='true'

          end

           i=i-1;

      end

      end

I tried to apply the function above to a script that creates the matrix that the function above asks for input in variable A but as I put in a character for one index in the matrix C below like 'x' it gets stored in the matrix as the ASCII-number instead of the character and the function isWinner can't function (at least this seems to be the problem). How do I change this? Here is the function:

   C=ones(3,3);

finished=0;

while finished==0

r=input('write roow for x: ');

k=input('write column for for x: ');

      while C(r,k)~=1

      fprintf('coordinates %d, %d are taken by %c\n', r, k, C(r,k)) 

      r=input('write row for x: ');

k=input('write column for x: ');

end

C(r,k)='x';

check=isWinner(C,'x');

if strcmp(check,'true')

      disp('x wins')

      finished=1;

end

if finished==0

      r=input('write row for 0: ');

k=input('write column for 0: ');

   while C(r,k)~=1

      fprintf('coordinates %d, %d are taken by %c\n', r, k, C(r,k)) 

      r=input('write row for 0: ');

k=input('write column for 0: ');

end

C(r,k)='0';

check=isWinner(C,'0');

if strcmp(check,'true')

      disp('0 wins');

      finished=1;

end

end

end

Answer 1

[Walter Roberson]

Do not initialize your

C=ones(3,3);

Instead,

C = char(zeros(3,3));

By the way, have you considered using the logical constants true and false instead of the strings 'true' and 'false' ?

[Tor Fredrik Hove]

thank you very much!

I wonder why the answer sheet for the assignment works. They start up with a 3 times 3 zero-matrix but still the game works. It is here:

function vinner = tripptrapp

Brett = [0 0 0; 0 0 0; 0 0 0];

spiller = 'x';

vinner = 0;

while (tellPlasser(Brett) > 0 && vinner == 0)

rad = input(sprintf('%s, choose row: ', spiller));

kolonne = input(sprintf(' %s, choose column: ', spiller));

if (Brett(rad,kolonne) == 0)

Brett(rad,kolonne) = spiller;

if (erVinnerfasit(spiller, Brett))

vinner = spiller;

disp(sprintf(' %s won!', spiller));

end

if (spiller == 'x')

spiller = 'o';

else

spiller = 'x';

end

else

disp('already taken coordinates!');

end

end

if (vinner == 0)

disp('It''s a tie!');

end

[Tor Fredrik Hove]

it uses theese two functions:

function vinner = erVinnerfasit(spiller, Brett)

vinner = 0;

diagonalt_fra_hoyre = 0;

diagonalt_fra_venstre = 0;

for i=1:size(Brett)

horisontalt = 0;

vertikalt = 0;

for j=1:size(Brett, 2)

if (Brett(i,j) == spiller)

horisontalt = horisontalt + 1;

end

if (Brett(j,i) == spiller)

vertikalt = vertikalt + 1;

end

if (i==j && Brett(j, i) == spiller)

diagonalt_fra_venstre = diagonalt_fra_venstre + 1;

end

if (((i==3 && j==1) || (i==2 && j==2) || (i==1 && j==3)) &&

Brett(i,j)==spiller)

diagonalt_fra_hoyre = diagonalt_fra_hoyre + 1;

end

end

if (diagonalt_fra_venstre == 3 || diagonalt_fra_hoyre == 3 ||

vertikalt == 3 || horisontalt == 3)

vinner = 1;

break;

end

end

the second function it uses:

function out=tellPlasser(A)

[N M]=size(A);

num=0;

for i=1:N

for j=1:M

if A(i,j)==0

num=num+1;

end

end

end

out=num;