How to verify if a row or a column or a cubic 3x3 have a repeated number for sudoku?

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Say i got an 9x9 array and want to write a function to check if any row or column or 3x3 cell have a repeat number or not for sudoku. it would return a bolean value depend on the result. Any suggestion? Thank

Answers (1)

Walter Roberson
Walter Roberson on 16 May 2021
Suppose you store NaN for all slots that have not had anything written to them. Then extract the appropriate portion of the array, such as
s = A(4:6, 1:3);
s(isnan(s)) = [];
had_dup = numel(unique(s)) ~= numel(s);

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