Is there a way to average a function? 

For example, a 14 day simple average of  ((C-XAvgC6)*SGN(C>XavgC16))

The PCF Avg((C-XavgC6)*SGN(C>Xavg6),14) does not work.

The actual complete formula would be something like this:

100 - ( 100 /  ( 1 + (Avg((C-XavgC6)*SGN(C>Xavg6),14) / Avg((XavgC6-C)*SGN(XavgC6>C),14)))

Appreciate your help in showing me whether this is possible to do.  Thanks.

The forumula is called Slow RSI and is in Technical Analysis of Stocks and Commodities magazine April 2015 issue. 

David Chu

You are going to have to manually expand the moving averages.

100 - ( 100 /  ( 1 + ((C > XAVGC6) * (C - XAVGC6) + (C1 > XAVGC6.1) * (C1 - XAVGC6.1) + (C2 > XAVGC6.2) * (C2 - XAVGC6.2) + (C3 > XAVGC6.3) * (C3 - XAVGC6.3) + (C4 > XAVGC6.4) * (C4 - XAVGC6.4) + (C5 > XAVGC6.5) * (C5 - XAVGC6.5) + (C6 > XAVGC6.6) * (C6 - XAVGC6.6) + (C7 > XAVGC6.7) * (C7 - XAVGC6.7) + (C8 > XAVGC6.8) * (C8 - XAVGC6.8) + (C9 > XAVGC6.9) * (C9 - XAVGC6.9) + (C10 > XAVGC6.10) * (C10 - XAVGC6.10) + (C11 > XAVGC6.11) * (C11 - XAVGC6.11) + (C12 > XAVGC6.12) * (C12 - XAVGC6.12) + (C13 > XAVGC6.13) * (C13 - XAVGC6.13)) / ((C < XAVGC6) * (XAVGC6 - C) + (C1 < XAVGC6.1) * (XAVGC6.1 - C1) + (C2 < XAVGC6.2) * (XAVGC6.2 - C2) + (C3 < XAVGC6.3) * (XAVGC6.3 - C3) + (C4 < XAVGC6.4) * (XAVGC6.4 - C4) + (C5 < XAVGC6.5) * (XAVGC6.5 - C5) + (C6 < XAVGC6.6) * (XAVGC6.6 - C6) + (C7 < XAVGC6.7) * (XAVGC6.7 - C7) + (C8 < XAVGC6.8) * (XAVGC6.8 - C8) + (C9 < XAVGC6.9) * (XAVGC6.9 - C9) + (C10 < XAVGC6.10) * (XAVGC6.10 - C10) + (C11 < XAVGC6.11) * (XAVGC6.11 - C11) + (C12 < XAVGC6.12) * (XAVGC6.12 - C12) + (C13 < XAVGC6.13) * (XAVGC6.13 - C13))))