Trying to port linreg function in tradingview to C#

[phivanloi]

Currently I'm trying to port an indicator from tradingview Pine to C#. But I'm having difficulty with the linreg function in tradingview and can't find a corresponding function with the Stock.Indicators library.
I'm currently trying to use the GetSlope function and then get the value
Intercept + Slope * (Length - 1 - 0) also fails.
Hope someone can assist.
i am trying to port the following indicator to c#
https://www.tradingview.com/script/nqQ1DT5a-Squeeze-Momentum-Indicator-LazyBear/

[phivanloi]

Someone help me. How to correctly calculate the linreg function of trading view or its calculation formula