Alert when SMA within x percent of another SMA

I updated the title of your question so its easier for other viewers to find this post using the search function. I have also moved this out of the Chart Studies topic and into the Alerts and Notifications topic, since you included "Study Alerts" in your list of tags.

I have not taken the time to test this. But it should work. Be sure to let us know.

input withinPercent = 0.1;
input maLengthOne = 9;
input maTypeOne = AverageType.EXPONENTIAL;
input maPriceOne = close;
input maLengthTwo = 200;
input maTypeTwo = AverageType.EXPONENTIAL;
input maPriceTwo = close;
def maOne = MovingAverage(maTypeOne, maPriceOne, maLengthOne);
def maTwo = MovingAverage(maTypeTwo, maPriceTwo, maLengthTwo);
def upperBound = maTwo * (1 + withinPercent * 0.01);
def lowerBound = maTwo * (1 - withinPercent * 0.01);
plot signal = maOne > lowerBound and maOne < upperBound;