求助：Pine Script中strategy.entry未执行及累计值异常问题

核心问题1：accumulation变量被重复初始化 #

你声明float accumulation = 0时未使用var关键字，Pine Script会在每根K线重新计算时将变量重置为0，导致它无法累计数值，仅能在触发条件时临时变为单次买入量，下一根K线又回到0。

修复：用var关键字声明变量，确保脚本运行期间仅初始化一次：

var float accumulation = 0

核心问题2：时间触发条件的精度不匹配 #

你的时间条件要求hour(time) == 12.0且minute(time) == 0.0，但如果图表时间框架不是分钟级（比如日线、周线），K线的time字段对应K线开盘时间，永远无法满足中午12点的条件，直接导致买入逻辑完全不触发。

另外weekofyear(time) % 2 == 1.0的逻辑存在缺陷：

• 跨年时周数会重置，可能引发连续两周触发或跳过的问题
• 不同交易所的周起始定义可能存在差异，导致触发时间混乱

更可靠的时间触发方案 #

用var变量记录上次买入的周数，实现稳定的隔周买入逻辑：

var int last_buy_week = na
current_week = weekofyear(time)
current_day = dayofweek(time)

// 周二触发（dayofweek=2对应周二），且与上次买入间隔至少一周
if current_day == 2 and (na(last_buy_week) or current_week > last_buy_week + 1)
    strategy.entry(id = "Buy", direction = strategy.long, qty=investment_amount/close)
    accumulation += investment_amount/close
    last_buy_week := current_week

如果必须指定中午12点触发，需切换到1分钟时间框架，同时精准匹配时间点：

if dayofweek(time) == 2 and hour(time) == 12 and minute(time) == 0
    // 买入逻辑

其他细节优化 #

• float(investment_amount/close)可简化为investment_amount/close，Pine Script会自动处理类型转换
• 可添加strategy.risk.allow_entry_in()确保策略允许在指定时间入场，避免默认入场限制

完整修复后的代码 #

// This strategy buys the asset displayed on the active chart every other week.
strategy("Dollar Cost Averaging")

// Set the amount of USD to buy the asset.
investment_amount = 75

// Variable to track accumulation (var keeps value across bars)
var float accumulation = 0
// Track last buy week to avoid repeated triggers in same week
var int last_buy_week = na

current_week = weekofyear(time)
// 周二触发（dayofweek=2），且为隔周的周二
if dayofweek(time) == 2 and (na(last_buy_week) or current_week != last_buy_week) and current_week % 2 == 1
    // Buy
    strategy.entry(id = "Buy", direction = strategy.long, qty=investment_amount/close)
    // Update accumulation
    accumulation += investment_amount/close
    // Record current week as last buy week
    last_buy_week := current_week

// Plot accumulation to verify
plot(accumulation, title="Total Asset Accumulated", color=color.green)

内容的提问来源于stack exchange，提问作者B3ntley