Checking if some elements of a cell array are identical?

Question

Is there an easy way that you can check if all elements in a row or column or any of the diagonals are the same thing?

a={'o','','o';
   'x','o','o';
   'x','o','o'}

How can I check if all elements in a row or column or any of the diagonals are the same thing?

What is the size (dimensions) of your cell array? give an example with desired results! — Santhan Salai
– Santhan Salai, Commented May 5, 2015 at 5:58

Mohsen Nosratinia · Accepted Answer · 2015-05-05 07:26:10Z

2

you can employ isequal and use the fact that it can accept multiple arguments and indexing cell arrays can create comma-separated lists:

for second row:

>> isequal(a{2,:})
ans =
     0

for third column:

>> isequal(a{:,3})
ans =
     1

for diagonal:

>> isequal(a{logical(eye(size(a)))})
ans =
     1

for anti-diagonal:

>> isequal(a{flipud(logical(eye(size(a))))})
ans =
     0

answered May 5, 2015 at 7:26

Mohsen Nosratinia

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Divakar · Accepted Answer · 2015-05-05 07:13:08Z

1

One approach with unique, few diff's and combinations of any, all -

%// Tag each cell element based on their uniqueness among other cells
[~,~,idx] = unique(a)
ar = reshape(idx,size(a))

%// Perform checks along columns, rows, diagonals and anti-diagonals
col_check = any(all(diff(ar,[],1)==0,1))
row_check = any(all(diff(ar,[],2)==0,2))
diag_check = all(diff(ar(eye(3)==1))==0)
antidiag_check = all(diff(ar(fliplr(eye(3))==1))==0)

%// Finally check if any of the checks are true for the final output
out = col_check | row_check | diag_check | antidiag_check

Sample run -

a = 
    'x'    ''     'o'    'o'
    ''     'o'    'o'    'o'
    'o'    'o'    'o'    'x'
    'o'    'o'    'o'    'o'
col_check =
     1
row_check =
     1
diag_check =
     0
antidiag_check =
     0
out =
     1

edited May 5, 2015 at 7:13

answered May 5, 2015 at 7:06

Divakar

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