Find sum of negative elements in row.
Example x=[1 -5 3 4 -6 6 7 8 9 10]
result = -11
Make one big string out of two smaller strings
Create a vector whose elements depend on the previous element
construct matrix with identical rows
Help the Patriots get to the Super Bowl
Find the sines of an isosceles triangle when given its area and height
Replace x value into y value in string text.
Form a square matrix from four square sub-matrices
Convert array of decimal numbers into hexadecimal numbers array.
Delete x value in given vector y.
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