Pine 脚本/外部数据替代方案 [英] Pine Script / External Data Alternative
问题描述
据我所知,Pine Script 目前不接受外部数据.我有 1 个趋势线的静态 x1v 和 x2v 坐标,每条趋势线有 2000 个符号,我想为每个符号输入 Pine Script.当 syminfo.tickerid 与这些值的字符串匹配时,我希望 Pine Script 仅为相应的符号绘制趋势线.
As far as I know, Pine Script does not accept external data currently. I have static x1v and x2v coordinates for 1 trendline each for 2000 symbols that I would like to input into Pine Script for each symbol. When syminfo.tickerid matches with a string for these values, I would like Pine Script to plot trend lines only for the respective symbol.
我尝试过的一种方法如下:
One approach I tried is as following:
//@version=4
study('TEST', overlay=true, title = "test")
x1v = int(na)
x2v = int(na)
x1v := iff(syminfo.ticker == 'AAPL', 20,x1v)
x2v := iff(syminfo.ticker == 'AAPL', 6,x2v)
x1v := iff(syminfo.ticker == 'MSFT', 20,x1v)
x2v := iff(syminfo.ticker == 'MSFT', 6,x2v)
x1v := iff(syminfo.ticker == 'OPEN', 20,x1v)
x2v := iff(syminfo.ticker == 'OPEN', 6,x2v)
x1v := iff(syminfo.ticker == 'SPY', 20,x1v)
x2v := iff(syminfo.ticker == 'SPY', 6,x2v)
myline = line.new(x1=bar_index-x1v, y1=high[x1v], x2=bar_index-x2v, y2=high)
line.set_extend(myline, extend.both)
line.delete(myline[1])
对 2000 个符号执行此操作,生成 4000 多行,Pine Script 不接受它说:脚本在#f2"中有太多局部变量(5187):#mut_0、#mut_1、#mut_0、#mut_1、#mut_0...限制为1100
Doing this for 2000 symbols, produces 4000+ lines and Pine Script does not accept it saying: Script has too many local variables (5187) in "#f2": #mut_0, #mut_1, #mut_0, #mut_1, #mut_0... The limit is 1100
即使局部变量是相同的 x1v 和 x2v.
Even though the local variables are the same x1v and x2v.
是否有其他选择可以克服这个问题或使其更紧凑?
Is there any other option to overcome this or to make this more compact?
推荐答案
这是一种方法.
我已经包含了两种方法:
Here's a way to do it.
I've included 2 methods:
f_fill_array_all_tickers()
- 看起来更干净
- 可能会更慢.
- 看起来不太干净
- 可能会更快,具体取决于代码在列表中的位置.
该脚本有一个输入复选框
i_fill_array_all_tickers
可让您在 2 种方法之间进行选择.The script has an input checkbox
i_fill_array_all_tickers
to let you choose between the 2 methods.由于可读性/可维护性,我个人会选择
f_fill_array_all_tickers()
.I'd personally go for
f_fill_array_all_tickers()
because of readability/maintainability.//@version=4 study("Lines", "LI", true) var bool i_fill_array_all_tickers = input(false, "Fill array with ALL tickers") var string[] a_ticker = array.new_string() var int[] a_x1 = array.new_int() var int[] a_x2 = array.new_int() var line myLine = line.new(na, na, na, na, extend=extend.both) f_add(_ticker, _x1, _x2) => if array.includes(a_ticker, _ticker) // update existing ticker idx = array.indexof(a_ticker, _ticker) array.set(a_x1, idx, _x1) array.set(a_x2, idx, _x2) else // insert new ticker array.push(a_ticker, _ticker) array.push(a_x1, _x1) array.push(a_x2, _x2) f_fill_array_all_tickers() => //fill array with data for ALL tickers f_add("AAPL", 20, 6) f_add("MSFT", 20, 6) f_add("OPEN", 20, 6) f_add("SPY" , 20, 6) f_fill_array_current_ticker_only() => //fill array with data for only the CURRENT tickers if syminfo.ticker == "AAPL" f_add(syminfo.ticker, 20, 6) else if syminfo.ticker == "MSFT" f_add(syminfo.ticker, 20, 6) else if syminfo.ticker == "OPEN" f_add(syminfo.ticker, 20, 6) else if syminfo.ticker == "MSFT" f_add(syminfo.ticker, 20, 6) f_fill_array() => if i_fill_array_all_tickers f_fill_array_all_tickers() else f_fill_array_current_ticker_only() if barstate.isfirst f_fill_array() if barstate.islast and array.includes(a_ticker, syminfo.ticker) idx = array.indexof(a_ticker, syminfo.ticker) x1 = array.get(a_x1, idx) x2 = array.get(a_x2, idx) line.set_xy1(myLine, bar_index - x1, high[x1]) line.set_xy2(myLine, bar_index - x2, high)
最小化代码
//@version=4 study("Lines", "LI", true) var a_ticker = array.new_string() var a_x1 = array.new_int() var a_x2 = array.new_int() var myLine = line.new(na, na, na, na, extend=extend.both) ai(a,v) => array.includes(a,v) ax(a,v) => array.indexof(a,v) as(a,i,v) => array.set(a,i,v) ag(a,i) => array.get(a,i) ap(a,v) => array.push(a,v) f(t,a,b) => if ai(a_ticker,t) i = ax(a_ticker,t),as(a_x1,i,a),as(a_x2,i,b) else ap(a_ticker,t),ap(a_x1,a),ap(a_x2,b) a() => f("AAPL",20,6),f("MSFT",20,6),f("OPEN",20,6),f("SPY",20,6) if barstate.isfirst a() if barstate.islast and ai(a_ticker, syminfo.ticker) idx = ax(a_ticker, syminfo.ticker) x1 = ag(a_x1, idx) x2 = ag(a_x2, idx) line.set_xy1(myLine, bar_index - x1, high[x1]) line.set_xy2(myLine, bar_index - x2, high)
这似乎有效,10 行,每行 100 个元素
This seems to work, with 10 lines of 100 elements each
//@version=4 study("Lines", "LI", true) var a_ticker = array.new_string() var a_x1 = array.new_int() var a_x2 = array.new_int() var myLine = line.new(na, na, na, na, extend=extend.both) ai(a,v) => array.includes(a,v) ax(a,v) => array.indexof(a,v) as(a,i,v) => array.set(a,i,v) ag(a,i) => array.get(a,i) ap(a,v) => array.push(a,v) f(t,a,b) => if ai(a_ticker,t) i = ax(a_ticker,t),as(a_x1,i,a),as(a_x2,i,b) else ap(a_ticker,t),ap(a_x1,a),ap(a_x2,b) a() => 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if barstate.isfirst a() if barstate.islast and ai(a_ticker, syminfo.ticker) idx = ax(a_ticker, syminfo.ticker) x1 = ag(a_x1, idx) x2 = ag(a_x2, idx) line.set_xy1(myLine, bar_index - x1, high[x1]) line.set_xy2(myLine, bar_index - x2, high)
小改进.
当在最后一个柱上调用a()
而不是barstate.isfirst
时,运行时不必将所有历史柱上的数组保存在内存中.Little improvement.
When callinga()
on the last bar instead ofbarstate.isfirst
, the runtime doesn't have to keep the arrays in memory on all the historical bars.if barstate.islast a() if ai(a_ticker, syminfo.ticker) idx = ax(a_ticker, syminfo.ticker) x1 = ag(a_x1, idx) x2 = ag(a_x2, idx) line.set_xy1(myLine, bar_index - x1, high[x1]) line.set_xy2(myLine, bar_index - x2, high)
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