You have asked to not use the std() function and yet you are not checking if the solution code use the function or not. Kindly update the solution test suites. (Refer to the leading solution of this problem).
Sum the elements in either diagonal of a square matrix
Volume and area of a sphere
Matlab Basics - Convert a row vector to a column vector
Draw 'O' !
Find the second biggist number in a vector or a matrix
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