Indexing/slicing/subsetting

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`arr[5]`	Returns the element at index 5
`arr[2,5]`	Returns the 2D array element on index [2][5]
`arr[1]=4`	Assigns array element on index 1 the value 4
`arr[1,3]=10`	Assigns array element on index [1][3] the value 10
`arr[0:3]`	Returns the elements at indices 0,1,2 (On a 2D array: returns rows 0,1,2)
`arr[0:3,4]`	Returns the elements on rows 0,1,2 at column 4
`arr[:2]`	Returns the elements at indices 0,1 (On a 2D array: returns rows 0,1)
`arr[:,1]`	Returns the elements at index 1 on all rows
`arr<5`	Returns an array with boolean values
`(arr1<3) & (arr2>5)`	Returns an array with boolean values
`~arr`	Inverts a boolean array
`arr[arr<5]`	Returns array elements smaller than 5

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