Given two vectors of the same size, repeat the values of the first vector the number of times given in a second vector. For example:
x1=[1 2 3 4 5 6];
x2=[2 2 1 1 2 2];
out=[1 1 2 2 3 4 5 5 6 6];
Check if sorted
given 3 sides, find area of this triangle
Specific Element Count
Matlab Basics II - Count rows in a matrix
Divide by 4
Negative without '-'
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