50 EMA Cross

I appreciate Nick jumping in there and providing an answer. However his code does not include the alerts which were a core component of the request. Here is my solution which also provides user inputs for the length and type of moving average.

input length = 50;
input averageType = AverageType.EXPONENTIAL;
plot ma = MovingAverage(averageType, close, length);
plot crossAbove = close[1] < ma[1] and close > ma;
crossAbove.SetPaintingStrategy(PaintingStrategy.BOOLEAN_ARROW_UP);
crossAbove.SetDefaultColor(Color.CYAN);
crossAbove.SetLineWeight(3);
plot crossBelow = close[1] > ma[1] and close < ma;
crossBelow.SetPaintingStrategy(PaintingStrategy.BOOLEAN_ARROW_DOWN);
crossBelow.SetDefaultColor(Color.MAGENTA);
crossBelow.SetLineWeight(3);
Alert(crossAbove, "Cross Above", Alert.BAR, Sound.RING);
Alert(crossBelow, "Cross Below", Alert.BAR, Sound.RING);

Simply create new study and paste this in

#####

plot EMA50UP = MovAvgExponential(“length” = 50).”AvgExp” crosses above close;
plot EMA50DOWN= MovAvgExponential(“length”= 50).”AvgExp”
crosses below close;
EMA50DOWN.SetPaintingStrategy(PaintingStrategy.BOOLEAN_ARROW_up);
EMA50DOWN.SetDefaultColor(GetColor(4));
EMA50DOWN.SetLineWeight(3);
EMA50UP.SetPaintingStrategy(PaintingStrategy.BOOLEAN_ARROW_down);
EMA50UP.SetDefaultColor(GetColor(5));
EMA50UP.SetLineWeight(3);