i think it should be if statement please help

A vector is given by V = [-4, 17, -3, 8, -7, 12, 30, -6, 6, -6, -7, 15, 4, 7, 9]. Write an m-file which doubles the elements that are positive and are divisible by 3 or 5, and, raises to the power of 4 the elements that are negative and greater than -5. If a number does not satisfy either condition, square the value. Store the modified data into a new vector. Create a 2x1 subplot (stacked vertically). In the top subplot, plot the raw unaltered data as red squares. In the bottom subplot, plot the altered data as blue circles.