Might be a good idea to change the test suite to "assert(isequal(cube3(),cube3().^3))" so that the answer isn't revealed by looking at the test suite.
Michael C. had a good point, but you also need "assert(numel(unique(cube3()))==3)"
Yo may need to check for length 3
Add a test to assert that length == 3.
It would be a good idea to check that a length 3 vector is returned.
Replace NaNs with the number that appears to its left in the row.
Back to basics 13 - Input variables
Duplicate each element of a vector.
Detect a number and replace with two NaN's
Sum the 'edge' values of a matrix
MATCH THE STRINGS (2 CHAR) very easy
Find the logic
Is it an Armstrong number?
Given a matrix, swap the 2nd & 3rd columns
find radius of cone
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