It's a good problem, and I liked that you've included even a motivation for it (most problems at Cody are unpolished and unlike yours). However, most Cody players would probably skip this problem because programming problems are usually very objective, they will give us a task with maybe some examples of expected output.
Times 2 - START HERE
Matlab Basics - Logical Tests I
Matlab Basics II - Determine if an array has a 3rd dimension
Replace every 3rd element in a vector with 4
An Ohm's Law Calculator
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