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().
Switch matrix to a column vector
Finding an element in a vector
Calculate the number of elements in a matrix.
Area of a Square
Sum of Two Numbers
Matrix Generation from Vector Multiplication
Simple Vector Addition
String Delimination and Outputting
Vector indexing: lower than mean
Find the sum of the largest two elements in a vector
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