x is the abscissa. find the absolute value of cosine of -x and the same value with changed sign.
In addition to the weak test suite: The title of the problem says "Sinus function", yet the (incomplete) problem description mentions only "cosine" ??? Furthermore, should abs(cos(-x)) be assigned to y, or to z?
Please improve the test cases. Returning 1 and -1 is complete enough with these sloppy tests.
bad test suite
The test suite is not very rigorous...
Replace NaNs with the number that appears to its left in the row.
Back to basics 12 - Input Arguments
Getting logical indexes
frame of the matrix
Find the function 2
Distance of the centroids of the balls
Center of mass
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