I'll preface this with I have done OOP all my professional and amateur career (save for the one semester of BASIC I took in high school) and I'm still having issues understanding macros and the best way to use them.
That said, I'm writing a library to use for technical analysis on stocks/forex/futures/etc and am getting to the
Aroon indicator. Basically the calculation is the same except for looking for a high for one part and then the low for the other part. Below is my naive first pass at solving the problem:
def aroon_up(prices) do number_of_periods = prices |> Enum.count corrected_prices = prices |> Enum.reverse high_period = calc_high(prices, 0, 0) (number_of_periods - high_period) / (number_of_periods * 100) end defp calc_high(prices, high, count) do case prices do [hd | tl] when hd > high -> calc_high(tl, hd, count + 1) [hd | tl] -> calc_high(tl, high, count + 1) [hd] when hd > high -> count _ -> count end end def aroon_down(prices) do number_of_periods = prices |> Enum.count corrected_prices = prices |> Enum.reverse low_period = calc_low(prices, nil, 0) (number_of_periods - low_period) / (number_of_periods * 100) end defp calc_low(prices, low, count) do case prices do [hd | tl] when low == nil -> calc_low(tl, hd, count + 1) [hd | tl] when hd < low -> calc_low(tl, hd, count + 1) [hd | tl] -> calc_low(tl, low, count + 1) [hd] when low == nil -> count [hd] when hd < low -> count _ -> count end end
You'll notice there is a lot of repeating code. I'd love to be able to generate the base of the code from a macro but I'm stumped on how to do this without basically writing a bunch of case statements. Is this a valid use case for macros here or am I just over thinking the problem?
Aroon indicator is an unusual indicator that can help you spot the strength of a trend and ride that trend until a buy or sell climax is reached. We like how versatile the Aroon Up and down indicator is. The triangular Aroon oscillator lines make it so much easier for the untrained eye to spot buy and sell signals. Aroon Indicator: The Aroon indicator is a technical indicator used for identifying trends in an underlying security and the likelihood that the trends will reverse. It is made up of two lines: one ... The Aroon indicator was d eveloped by Tushar Chande in 1995, and is an indicator based trading system that determines whether a trading instrument is trending or not and how strong the trend is.As conceived by the creator, Aroon had to determine points for entering trades before other indicators and inform traders about this. The Aroon Indicator Strategy – How to Use the Aroon Indicator in Forex Trading This is the second article in our Aroon Indicator series. If you haven’t already we suggest that you check out the first article about the Aroon Indicator . If Aroon Up intersects the Aroon Down line from top to bottom, this is a signal to exit the purchase (Forex trading). On the contrary, intersection of the Aroon Up line by the Aroon Down line from top to bottom indicates the emergence and possible development of a down trend and the possibility of opening a sell position.
Aroon roughly translates to "Dawn's Early Light," which tells you everything you need to know about the purpose of this indicator. Learn why it was created and how it can function in your trading ... Forex Trading Strategy With Aroon Indicator very simplify In this video you will learn how to trade with Aroon indicator and be successful with it! Aroon i... ForexMT4Indicators.com are a compilation of free download of forex strategies, forex systems, forex mt4 indicators, forex mt5 indicators, technical analysis and fundamental analysis in forex trading. Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube. This lesson describes the Aroon indicator, and three chart examples are used to show how it works.. Learn to trade Like a Pro - Join the StockGoodies Communi...
