MACD Line

Problem

Compute the MACD line as the difference between the final values of two exponential moving averages of the price series with spans short_span and long_span. Each EMA uses smoothing factor 2 / (span + 1) and is initialized with the first price.

Return 0.0 for an empty series.

Hint

The shorter EMA reacts faster, so a rising market gives a positive MACD.

Test cases

case 1

in: [[1,2,3,4,5],2,3]

expected: 0.4436728395061724

case 2

in: [[5,5,5],12,26]

expected: 0

case 3

in: [[10],3,5]

expected: 0

case 4

in: [[10,9,8,7,6],2,4]

expected: -0.8117728395061725

Starter codePython

def macd_line(prices, short_span, long_span):
    # Your code here
    pass

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