// Downloaded From https://www.WiseStockTrader.com
// Vortex Indicator 
// S&C Traders Tips Jan 2010 
period = Param("Period", 14, 2 ); 

VMP = Sum( abs( H - Ref( L, -1 ) ), period ); 
VMM = Sum( abs( L - Ref( H, -1 ) ), period ); 
STR = Sum( ATR( 1 ), period ); 

VIP = VMP / STR; 
VIM = VMM / STR; 

Plot( VIP, "VI"+period+"+", colorBlue); 
Plot( VIM, "VI"+period+"-", colorRed );