Without sigma OK, but without x ?
hint: I learned this trick from FrequencyDomain by studying the testsuite in the get_me v4 problem (http://www.mathworks.com/matlabcentral/cody/problems/1752-get-me-v4-cody-hacking-challenge), there is a very specific protection there against the hack needed to solve the 'x' issue here...
Thank you for this hint. It's obvious that the get_me v4 problem frustrates me.
middleAsColumn: Return all but first and last element as a column vector
Generate a vector like 1,2,2,3,3,3,4,4,4,4
Add two numbers
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