Linear Interpolation of Missing Points

Problem

Fill missing (None) entries by linear interpolation between the nearest known neighbors; leading and trailing gaps take the nearest known value. Return the completed list.

If every entry is missing, return a list of zeros of the same length.

Hint

Interpolate by the fraction of the distance between the bounding known points.

Test cases

case 1

in: [[1,null,3]]

expected: [1,2,3]

case 2

in: [[null,2,null,4]]

expected: [2,2,3,4]

case 3

in: [[1,2,3]]

expected: [1,2,3]

case 4

in: [[null,null]]

expected: [0,0]

Starter codePython

def linear_interpolation_missing(series):
    # Your code here
    pass

4 test cases · run your code against them in the editor