The Buy/Sell formula is:

(C-C1)/C1*100 + (C1-C2)/C2*100 + (C2-C3)/C3*100 + (C3-C4)/C4*100 + (C4-C5)/C5*100 + (C5-C6)/C6*100 + (C6-C7)/C7*100 + (C7-C8)/C8*100 + (C8-C9)/C9*100 + (C9-C10)/C10*100 + (C10-C11)/C11*100

If the previous day is negative and the current day is positive you BUY at open and if the previous day is positive and the current day is negative you sell at open. Pretty simple. I will be writing code to validate the data results.