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.
All your base are belong to us
Project Euler: Problem 7, Nth prime
Compute a dot product of two vectors x and y
Generate a vector like 1,2,2,3,3,3,4,4,4,4
Vector indexing: lower than mean
Find the index of the lowest number in a matrix
Matrix Ax=B problem
Find the sum of the largest two elements in a vector
Find the mean of two vectors
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