resolve_error，同时比较3种证券

Question

我想在3对中选择最好的交易: ETHUSDT，BNBUSDT，BTCUSDT。但是，代码不能编译，并出现错误: resolve error

考虑到周期是问题所在，我尝试了不同周期的代码。没有变化。当我删除结果的绘图时，错误消失了。但是，我猜编译器正在优化并删除问题代码

//START OF STUDY
//@version=3
study("Trio Switcher", overlay=false)
Version=input(1)
// BNBBTC
bnbSwitch = close > nz(open[1]) //or close > close[1]

AltCoin = input("ETH")
alt_bnb_pair = AltCoin + "BNB"
alt_btc_pair = AltCoin + "BTC"

alt_bnb_ticker=heikinashi(tickerid(syminfo.prefix,alt_bnb_pair))
alt_btc_ticker=heikinashi(tickerid(syminfo.prefix,alt_btc_pair))

//BNB base
alt_bnb_open = security(alt_bnb_ticker, period, open)
alt_bnb_close = security(alt_bnb_ticker, period, close)

//BTC base
alt_btc_open = security(alt_btc_ticker, period, open)
alt_btc_close = security(alt_btc_ticker, period, close)

altSwitch = bnbSwitch ? alt_bnb_close > nz(alt_bnb_open[1]) :  alt_btc_close > nz(alt_btc_open[1])

ALTPAIR = 2
BNBPAIR = 1
BTCPAIR = 0

activePair = altSwitch ? ALTPAIR : bnbSwitch ? BNBPAIR : BTCPAIR

alertcondition(activePair==ALTPAIR, "ALT")
alertcondition(activePair==BNBPAIR, "BNB")
alertcondition(activePair==BTCPAIR, "BTC")

plot(activePair)
//END OF STUDY

将此指示器添加到周期为1W的BNBBTC图表时，应仅绘制0、1或2

Answer 1

这将在Pine 4或5中运行。如果对加密资产返回true

isCryptoAsset = syminfo.type == 'crypto'