Pine Script新手求助：第11行for语句报错，预期'to <expression>'

1. 核心错误原因 #

你定义的djia_tickers是逗号分隔的字符串序列，而非Pine Script要求的数组类型。array.size()函数仅能作用于数组，传入非数组值会导致表达式无效，进而触发for循环的语法错误。

2. 修正步骤 #

步骤1：将字符串序列转为数组 #

把djia_tickers的定义改为用array.from()创建数组：

djia_tickers = array.from("AAPL", "MSFT", "JPM", "V", "GS", "DIS", "HD", "INTC", "MCD", "BA","UNH", "KO", "WMT", "PG", "AXP", "CAT", "CVX", "IBM", "MRK", "CSCO","XOM", "COST", "PFE", "TRV", "MMM", "AMGN", "WBA", "HON", "CRM", "NKE", "DD")

步骤2：修正逻辑错误（关键） #

原代码中if close < sma_stock使用的是当前图表的收盘价，而非目标股票的收盘价，会导致判断逻辑错误。需改为获取目标股票的收盘价：

stock_close = request.security(ticker, "D", close)
if stock_close < sma_stock
    stocks_below_sma := stocks_below_sma + 1

步骤3：完整修正后的代码 #

indicator("DIA ETF: 25% or Fewer Stocks Below 20-Day SMA", overlay=true)

// 修正：将字符串序列转为数组
djia_tickers = array.from("AAPL", "MSFT", "JPM", "V", "GS", "DIS", "HD", "INTC", "MCD", "BA","UNH", "KO", "WMT", "PG", "AXP", "CAT", "CVX", "IBM", "MRK", "CSCO","XOM", "COST", "PFE", "TRV", "MMM", "AMGN", "WBA", "HON", "CRM", "NKE", "DD")

sma_length = 20

stocks_below_sma = 0

// 现在array.size()可正常作用于数组，for循环语法合法
for i = 0 to array.size(djia_tickers) - 1
    ticker = array.get(djia_tickers, i)
    // 一次性获取目标股票的收盘价和SMA，提升效率
    [stock_close, sma_stock] = request.security(ticker, "D", [close, ta.sma(close, sma_length)])
    if stock_close < sma_stock
        stocks_below_sma := stocks_below_sma + 1

percent_below_sma = (stocks_below_sma / array.size(djia_tickers)) * 100

condition = percent_below_sma <= 25

plotshape(series=condition, location=location.belowbar, color=color.red, style=shape.labeldown, title="25% or Fewer Stocks Below 20-Day SMA", text="25% Below SMA")

barcolor(condition ? color.red : na)

3. 额外说明 #

• Pine Script中，数组需通过array.new_*()或array.from()显式创建，直接逗号分隔的字符串是元组类型，不支持数组操作函数。
• request.security()一次性获取多个值（如示例中的收盘价和SMA），可减少网络请求次数，提升脚本运行效率。

内容的提问来源于stack exchange，提问作者Guz