Problem 67. Find common elements in matrix rows

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Appears in Strings III

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Given a matrix, find all elements that exist in every row.
For example, given
 A =
     1 2 3 5
     9 2 5 9
     3 2 5 9
     1 2 1 5
     5 1 3 2
the answer would be the vector '2 5'. Elements should be returned sorted ascending.
Note there is no guarantee that there are any such elements; if there are none, the routine should return the empty set. Also, the matrix might contain NaNs, repeats, or very large or very small elements.

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David Verrelli on 25 May 2018

Following many comments, the Test Suite should be amended to check for an empty output vector using "isempty", rather testing for equality to []. Such an amendment is appropriate, and would not break any of the previously submitted successful solutions. —DIV

goc3 on 26 Oct 2020

Test cases with an empty result now test against isempty().

Siddharth on 28 Mar 2024

intresting

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Problem 67. Find common elements in matrix rows

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Problem 67. Find common elements in matrix rows

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