PineScript在寻找函数时有很好的参考，通常甚至提供pine代码来重新创建函数。
https://www.tradingview.com/pine-script-reference/v4/#fun_cci
cci的代码没有提供，但有一个逐步的解释。下面是我如何使用Pine重新创建cci函数，遵循参考中的步骤：

// This source code is subject to the terms of the Mozilla Public License 2.0 at https://mozilla.org/MPL/2.0/
// © bajaco

//@version=4
study("CCI Breakdown", overlay=false, precision=16)

cci_breakdown(src, p) =>
    // The CCI (commodity channel index) is calculated as the 
    // 1. difference between the typical price of a commodity and its simple moving average, 
    // divided by the 
    // 2. mean absolute deviation of the typical price. 
    // 3. The index is scaled by an inverse factor of 0.015 
    // to provide more readable numbers

    // 1. diff
    ma = sma(src,p)
    diff = src - ma
    
    // 2. mad
    s = 0.0
    for i = 0 to p - 1
        s := s + abs(src[i] - ma)
    mad = s / p
    
    // 3. Scaling
    mcci = diff/mad / 0.015
    mcci
    
plot(cci(close, 100))
plot(cci_breakdown(close,100))

我不知道平均绝对偏差是什么意思，但至少在他们的实现中，它似乎是从范围内的每个值的平均值的差异，但不改变平均值，因为你回去。
我不知道围棋，但这就是逻辑。