DMI算法有误，贡献一个更正后的算法

[王小牌]

通过和币安、欧易对比，DMI值相差非常大，应该是算法有误

[王小牌]

经过对算法分析，你这个算法部分地方有bug，正确代码如下：

def DMI(CLOSE, HIGH, LOW, M1=14, M2=6): 
    TR = SMA(MAX(MAX(HIGH - LOW, ABS(HIGH - REF(CLOSE, 1))), ABS(LOW - REF(CLOSE, 1))), M2)
    UP = HIGH - REF(HIGH, 1)
    DOWN = REF(LOW, 1) - LOW
    DMP = SMA(IF((UP > 0) & (UP > DOWN), UP, 0), M2)
    DMM = SMA(IF((DOWN > 0) & (DOWN > UP), DOWN, 0), M2)
    PDI = DMP * 100 / TR
    MDI = DMM * 100 / TR
    ADX = SMA(ABS(MDI - PDI) / (PDI + MDI) * 100, M1)
    ADXR = (ADX + REF(ADX, M1)) / 2
    return PDI, MDI, ADX, ADXR