必學常用函式(Function)(页 1) - PowerLanguage语言 - 龙听期货论坛

龙听发表于 2018-11-23 14:28

必學常用函式(Function)

[color=#444444][font=Arial, Tahoma, Helvetica, FreeSans, sans-serif]學常用保留字就像學英文單字，而學函式就像學英文片語，一樣沒巧門，基本的先背起來，以下列出必學常用的函式及運用範例：[/font][/color]

[color=#444444][font=Arial, Tahoma, Helvetica, FreeSans, sans-serif][b][color=purple]Average(Price,Length)[/color][/b][/font][/color]
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[/b][/font][/color]
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[/b][/font][/color]
[color=#444444][font=Arial, Tahoma, Helvetica, FreeSans, sans-serif]說明：計算平均值[/font][/color]
[color=#444444][font=Arial, Tahoma, Helvetica, FreeSans, sans-serif]參數：[/font][/color]
[list][*]Price：要求平均值的標的，可以是Open、High、Low、Close、Volume等等。[*]Length：幾抓近幾個值來計算平均，5就是算最近5個值來平均，以此類推。[/list][color=#444444][font=Arial, Tahoma, Helvetica, FreeSans, sans-serif]範例：畫簡單移動平均線[/font][/color]
[color=#444444][font=Arial, Tahoma, Helvetica, FreeSans, sans-serif]
[i]          Value1 = Average(Close,9);[/i][/font][/color]
[color=#444444][font=Arial, Tahoma, Helvetica, FreeSans, sans-serif][i]          Plot1(Value1, "AvgClose");[/i][/font][/color]
[color=#444444][font=Arial, Tahoma, Helvetica, FreeSans, sans-serif]
Average(Price,Length)也可以用AverageFC(Price,Length)取代，後者在演算上比較有效率。[/font][/color]
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[color=purple][b]Xaverage(Price, Length)[/b][/color][/font][/color]
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說明：計算加權移動平均值。給予越近期的值較高權重，以均線來講，會比簡單移動平均線來得敏感而貼近盤勢。[/font][/color]
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參數：[/font][/color]
[list][*]Price：要求加權移動平均值的標的，可以是Open、High、Low、Close、Volume等等[*]Length：幾抓近幾個值來計算平均，5就是算最近5個值來平均，以此類推。[/list][color=#444444][font=Arial, Tahoma, Helvetica, FreeSans, sans-serif]範例：畫加權移動平均線[/font][/color]
[color=#444444][font=Arial, Tahoma, Helvetica, FreeSans, sans-serif]
[i]          Value1 = XAverage(Close,9);[/i][/font][/color]
[color=#444444][font=Arial, Tahoma, Helvetica, FreeSans, sans-serif][i]          Plot1(Value1, "XAvgClose");[/i][/font][/color]
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[color=purple][b]Summation(Price, Length)[/b][/color][/font][/color]
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說明：加總，等於是EXCEL的SUM函式[/font][/color]
[color=#444444][font=Arial, Tahoma, Helvetica, FreeSans, sans-serif]參數：[/font][/color]
[list][*]Price：要加總計算的標的，可以是Open、High、Low、Close、Volume等等[*]Length：幾抓近幾個值來加總，5就是算最近5個值來加總，以此類推。[/list][color=#444444][font=Arial, Tahoma, Helvetica, FreeSans, sans-serif]範例：加總最近5根K棒的成交量[/font][/color]
[color=#444444][font=Arial, Tahoma, Helvetica, FreeSans, sans-serif]
[i]          Value1=Summation(Ticks,5)[/i];[/font][/color]

[font=Arial, Tahoma, Helvetica, FreeSans, sans-serif][b]CloseD(PeriodsAgo)[/b][/font]
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說明：抓日線的收盤價。一般我們的主圖是用日內分線，但常需要參考日線的開高低收價格，可以此函數直接取得。[/font][/color]
[color=#444444][font=Arial, Tahoma, Helvetica, FreeSans, sans-serif]參數：[/font][/color]
[list][*]PeriodsAgo：取幾天前的收盤價。[/list][color=#444444][font=Arial, Tahoma, Helvetica, FreeSans, sans-serif]範例：取前天收盤價[/font][/color]
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[i]          CloseD(1);[/i][/font][/color]
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其他Open(PeriodsAgo)、High(PeriodsAgo)、Low(PeriodsAgo)用法一樣。此外，尚有CloseW(PeriodsAgo)、CloseM(PeriodsAgo)、CloseY(PeriodsAgo)等內建函式可用運。[/font][/color]
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[color=purple][b]CountIF(Test,Length)[/b][/color][/font][/color]
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說明：累計過去一定K棒數中，符合特定條件的次數[/font][/color]
[color=#444444][font=Arial, Tahoma, Helvetica, FreeSans, sans-serif]參數：[/font][/color]
[list][*]Test：條件敘述[*]Length：檢定過去K棒數[/list][color=#444444][font=Arial, Tahoma, Helvetica, FreeSans, sans-serif]範例：計算過去12根K棒中，收盤大於開盤(紅K)總數。[/font][/color]
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[i]          Value1 = CountIF(Close > Open, 12);[/i][/font][/color]
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[b][color=purple]LastBarOnChart[/color][/b][/font][/color]
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說明：判斷程式執行K棒是否是最近一根K棒。傳回True或False。[/font][/color]
[color=#444444][font=Arial, Tahoma, Helvetica, FreeSans, sans-serif]參數：無[/font][/color]
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範例：如果希望警示音效只有在最近一根K棒才撥放[/font][/color]
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[i]          If LastBarOnChart Then[/i][/font][/color]
[color=#444444][font=Arial, Tahoma, Helvetica, FreeSans, sans-serif][i]                Condition1 = PlaySound("C:\window\ding.wav");[/i][/font][/color]
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[color=purple][b]AvgTrueRange(Length)[/b][/color][/font][/color]
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說明：計算平均真實區間。真實區間的用途相當廣泛，例如用來計算停損點數等。[/font][/color]
[color=#444444][font=Arial, Tahoma, Helvetica, FreeSans, sans-serif]參數：[/font][/color]
[list][*]Length：要計算幾個值來算平均[/list][color=#444444][font=Arial, Tahoma, Helvetica, FreeSans, sans-serif]範例：0.5[/font][/color][color=#444444][font=Arial, Tahoma, Helvetica, FreeSans, sans-serif]倍ATR點數停損[/font][/color]
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[i]          If marketposition=1 then [/i][/font][/color]
[color=#444444][font=Arial, Tahoma, Helvetica, FreeSans, sans-serif][i]             sell next bar at entryprice- AvgTrueRange(20)*0.5 stop;[/i][/font][/color]

[color=#444444][font=Arial, Tahoma, Helvetica, FreeSans, sans-serif]其他還有常用[b]指標類型的函式[/b]，僅列舉如下，建議可以參考內建指標或訊號，或是參考相關說明文件，觀摩這些函式是怎麼運用：[/font][/color]

[table]
[tr][td=1,1,319][b]函式[/b][/td][td=1,1,161][b]用途[/b][/td][/tr]
[tr][td=1,1,319]ADX(Length)[/td][td=1,1,161]ADX指標[/td][/tr]
[tr][td=1,1,319]BollingerBand(Price, Length, NumDevs)[/td][td=1,1,161]布林通道指標[/td][/tr]
[tr][td=1,1,319]MACD(Price, FastLength, SlowLength)[/td][td=1,1,161]MACD指標[/td][/tr]
[tr][td=1,1,319]Parabolic(AfStep)[/td][td=1,1,161]SAR指標[/td][/tr]
[tr][td=1,1,319]Stochastic(PriceH, PriceL, PriceC, StochLength, Length1, Length2, SmoothingType, oFastK, oFastD, oSlowK, oSlowD)[/td][td=1,1,161]KD指標[/td][/tr]
[/table][color=#444444][font=Arial, Tahoma, Helvetica, FreeSans, sans-serif][size=13px]
[b]統計類型的函式，列舉如下：[/b]

[/size][/font][/color]
[table]
[tr][td=1,1,319][b]函式[/b][/td][td=1,1,161][b]用途[/b][/td][/tr]
[tr][td=1,1,319]Correlation(Indep,Dep,Length)[/td][td=1,1,161]計算相關係數[/td][/tr]
[tr][td=1,1,319]StdDev(Price, Length)[/td][td=1,1,161]計算標準差

[/td][/tr]
[/table]

奇貨可居 发表于 2023-11-11 15:07

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必學常用函式(Function)