my first experiment
Congratulations on solving this problem. For future endeavours you might consider the following: (1) many common calculations already have dedicated functions available to compute them in MATLAB; (2) for generality you might have to initialise y=-Inf, not y=0; (3) for generality you might have to iterate over 1:size(x,#), not 1:2.
Sum of diagonals elements of a matrix
Simple Vector Addition
Sum two matrices
Vector indexing: lower than mean
Find the sum of the largest two elements in a vector
Check if inputted variable is a string or a number
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