Code for linear weighted moving avergae and smoothed moving average

Algos, strategies, code
1

want to know the code for linear weighted moving average and smothed moving average. in pi

2

Linear weighted moving average is not available in tradescript , you can check weighted moving average 

Example

CLOSE > WMA(CLOSE, 30)

and for Welles Wilder Smoothing (Moving Average)

Example

CLOSE > WWS(CLOSE, 30)
3

. is it posssible to write code