Problem 774. Remove from a 2-D matrix all the rows that contain at least one element less than or equal to 4

Created by Julio

Example:

 in = magic(5)

 in =

    17    24     1     8    15
    23     5     7    14    16
     4     6    13    20    22
    10    12    19    21     3
    11    18    25     2     9

 out = 
    23     5     7    14    16

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41 solvers submitted 96 solutions (2.34 solutions/solver).

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7 Comments

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Eszter Szucs on 19 Jun 2012

In the example the output is a vector, not a matrix as during the test run.

Richard Zapor on 20 Jun 2012

The example output is missing row 3.

Julio on 20 Jun 2012

In row 3, the element 4 is not less than 4 but less than or equal to 4 or greater than or equal to 4. This is the reason for removing this row.

Ned Gulley on 21 Jun 2012

I'm still puzzled by your example. Row 3 has no elements less than 4, therefore it should NOT be removed, right? But it was removed. That seems wrong. For this example to be correct, the problem should be called "Remove from a 2-D matrix all the rows that contain at least one element less than or equal to 4".

Ned Gulley on 22 Jun 2012

Thanks for making the change! It's a good problem.

Mark on 26 Jun 2012

The title and example are consistent. However the test case only removes rows with at least 1 element less than 4, which disagrees with title and example.

TAB on 26 Jun 2012

Need to modify the test case.

Problem 774. Remove from a 2-D matrix all the rows that contain at least one element less than or equal to 4

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41 solvers submitted 96 solutions (2.34 solutions/solver).

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