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4. Rewrite the following code using a vectorized operation in a single calculation within an assignment statement. Demonstrate the equivalency by coding and running both in matlab. Ir c] - size(nat): for 11 - 1 for 11- 1:0 mat(11,33) - mat(11,132 end end mat 5. Demonstrate the use of logical indexing to find the subvector of all scores less than 60 from a vector of scores [65, 36, 81, 68. 18,3, 16, 59.29.25. 22, 95, 62, 98, 30, 34, 8, 77, 32, 74). 6. The following is a recursive definition of a where a is any integer and n is a non-negative integer: if no agogh if no Write a recursive function that receives values of a and n as inputs and returns a' by using this recursive definition. You cannot use the operator anywhere in your program - use recursion instead