topRange

topRange(X)

X is a vector/tuple/matrix/table

For each element Xi in X, count the continuous nearest neighbors to its left that are smaller than Xi.

For each element in X, the function return the maximum length of a window to the left of X where it is the max/min. For example, after how many days a stock hits a new high.

topRange([13.5, 13.6, 13.4, 13.3, 13.5, 13.9, 13.1, 20.1, 20.2, 20.3])
// output
[0,1,0,0,2,5,0,7,8,9]

m = matrix(1.5 2.6 3.2 1.4 2.5 2.2 3.7 2.0, 1.6 2.3 4.2 5.6 4.1 3.2 4.4 6.9)
topRange(m)

//Simulate the stock price of stock A for 8 days. Use topRange to calculate after how many days the stock hit a new high
trades = table(take(`A, 8) as sym,  2022.01.01 + 1..8 as date, 39.70 39.72 39.80 39.78 39.83 39.92 40.00 40.03 as price)
select *, topRange(price) from trades

Related function: lowRange