Some questions in my mind...

1st: whats actually different in...

iMA(NULL,0,13,0,MODE_SMA,PRICE_CLOSE,0)
iMA(NULL,0,13,0,MODE_SMA,PRICE_CLOSE,1)
iMA(NULL,0,13,0,MODE_SMA,PRICE_CLOSE,-1)
iMA(NULL,0,13,0,MODE_SMA,PRICE_CLOSE,i)
iMA(NULL,0,13,0,MODE_SMA,PRICE_CLOSE,i+1)
iMA(NULL,0,13,0,MODE_SMA,PRICE_CLOSE,i-1)

2nd: If i have a chart saved in CSV file and i want to do the below thing manually in that CSV file by using excel formulas, how to do this?...

iMA(NULL,0,13,10,MODE_SMA,PRICE_CLOSE,i+1)
//---
iMA(NULL,0,13,-10,MODE_SMA,PRICE_CLOSE,i+1)

3rd: There are two types of simple calculations,

2 + 2 * 2 = 6   Scientific calculation.

2 + 2 * 2 = 8   Standard calculation.

Now for example. There are two Oscillators. Demarker (ranges between 0 to 1) and RSI (ranges between 0 to 100) and I want to do like;

Multiply Demarker by 100, then add RSI and after that, divide the value by 2 e.g; ((Dem*100)+(RSI))/2

I am confused in how to do things like this in mql.