The problem description is broken(?) and you have mentioned the code in the test suite (you might want to remove that)
The test suite has had the "solution" code removed. The description was also cleaned up. (If it's not loading, simply reload the page.) I'm not sure how much these fixes help, though...
Replace Vector Elements
Create a Multiplication table matrix...
Convert given decimal number to binary number.
Remove the positive integers.
Matlab Basics II - Create a vector with a repeated entry
Strange Number Algorithms
Magic Concentric Circles
Convert a Cell Array into an Array
Convert vector datasets to plot with imagesc instead of scatter
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