Please improve the test suite. There are two glaring problems. First, there is only one test case—it is recommended that at least three be provided, though more are often necessary to prevent hard-coded workarounds. Second, do not provide the solution in the test case(s). For such a problem, the answer should be calculated beforehand and provided as a predefined number to hide the solution. Furthermore, candidate functions can be checked against the solution using an adequate error bound (perhaps within 1E-3) rather than isequal().
Compute a dot product of two vectors x and y
Number of Horns on a unicorn!
Sum of diagonals elements of a matrix
Sum of the Matrix Elements
first element of matrix
Sum two matrices
More Simple String Concatenation
Matrix element wise multiplication
Simple String Concatenation
Vector Element Multiplication
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