Trailing Stop

[cptrader]

Plot0.Set(MIN(3)[0]

This plots the lowest low in the last three period.
If I was to use this as a trailing stop is there a function or method that allows the plot to stay at is max value until price touches or price closes below plot. Thanks

[NinjaTrader_JoshP]

if (Plot0[0] > Close[0])
     Plot0.Set(Plot0[0]);
else
     Plot0.Set(whatever value you want)

Basically just have an if-statement that sees when you want to change the plot value. If that particular criterion is not hit then do not change the plot value.