Sory I'm new member in this forum I always get difficult to correct thinkscript so with this forum I ams help to crrect my code or thinkscript....
Error Trendline indicator;
x = Cum(1);
perchg = 0.3*LastValue( Highest( ROC( Low, 50 ) ));
startvalue = LastValue( Trough( Low, perchg, 1 ) )...