[amibroker] req for afl code for Summation index based on metastock formula code

["rvlv" <rvlv@xxxxxxxxx>]

Hi Afl experts,
Please be kind to try to code amibroker formula for following ms code
of summation index.

thanks in advance.
rvlv with best regards

metastock Code:

================ 
Summation Index 
================ 
---8<----------------------- 

{ Summation index, aka % Exponential Moving Avg} 

{ User Inputs } 
wght:=Input("Weighting 0~100%", 
0,100,66.666667)/100; 
x:=Input("use Open=1 High=2 Low=3 Close=4 WClose=5 MP=6",1,6,4); 

{ Select price field } 
x:=If(x=1,O,If(x=2,H,If(x=3,L,If(x=5,WC(),If(x=6,MP(),C))))); 

{ Exponential %-weighted Moving Average } 
Ema:=x*wght+PREV*(1-wght); 

{ Plot on price chart } 
Ema 

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