a couple of issues: 1) I believe you are missing the input 'm' to wrapnan in your testsuite; 2) some numerical precision issues arise in the last test (e.g. rem(.8,.5)-.3 returns ~.5e-17), perhaps you could just round to two decimals the output of wrapnan so that we do not have to?
I fixed it. Thank you for reminding me. You might submit a shorter solution now.
Test Suite is currently broken due to the undefined function 'roundn' for input arguments of type 'double'.
Error in Test3 (line 5)
Very ['ni' 'ce'] HAHAHA
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