(Tradingview-Pine Script v5)v2到v5自引用变量错误

Question

我试图将pine v2转换为v5，但在第32行不断出错：未声明的标识符'pos'(下面的完整代码(，在处理这样的自引用变量时有点不知所措。

提前感谢

// This is code from pine v2
// sigpre1 = iff(xHigh <= xLowD, -1,
//   iff(xLow >= xHighD, 1, nz(pos[1], 0)))
sigpre1 = xHigh <= xLowD ? -1 : xLow >= xHighD ? 1 : nz(pos[1], 0)
// This is code from pine v2
// sigpre2 = iff( xHigh <= xHighD, -1,
//   iff(xLow >= xLowD, 1, nz(pos[1], 0)))
sigpre2 = xHigh <= xHighD ? -1 : xLow >= xLowD ? 1 : nz(pos[1], 0)
pos = SigVal ? sigpre1 : sigpre2
// This is code from pine v2
// possig = iff(reverse and pos == 1, -1,
//   iff(reverse and pos == -1, 1, pos))

这里是v2完整代码：

//@version=2
strategy(title="[Learning] Support Resistance", overlay = true)
width = input(2, minval=1)
SigVal = input(true, title="To Line  From Line")
reverse = input(false, title="Trade reverse")
xLow = low
xHigh = high
xHighD = security(tickerid,"W", high[1])
xLowD  = security(tickerid,"W", low[1])
sigpre1 = iff(xHigh <= xLowD, -1,
iff(xLow >= xHighD, 1, nz(pos[1], 0))) 
sigpre2 = iff( xHigh <= xHighD, -1,
iff(xLow >= xLowD, 1, nz(pos[1], 0))) 
pos = SigVal ? sigpre1 : sigpre2
possig = iff(reverse and pos == 1, -1,
iff(reverse and pos == -1, 1, pos))      
if (possig == 1) 
strategy.entry("Long", strategy.long)
if (possig == -1)
strategy.entry("Short", strategy.short)         
barcolor(possig == -1 ? red: possig == 1 ? green : blue )
plot(xLowD, color=green, title="S", style = circles, linewidth = width)
plot(xHighD, color=red, title="R", style = circles, linewidth = width)

Answer 1

问题是pos是在代码的后面定义的。但还有另一个问题。从v3开始，security()函数的lookahead参数的默认值已更改为barmerge.lookahead_off。因此，在v2中，它是barmerge.lookahead_on，您也应该在v5中使用它。

//@version=5
strategy(title="[Learning] Support Resistance", overlay = true)
width = input.int(2, 'Widht',minval=1)
SigVal = input.bool(true, title="To Line  From Line")
reverse = input.bool(false, title="Trade reverse")
xLow = low
xHigh = high
xHighD = request.security(syminfo.tickerid,"W", high[1], lookahead=barmerge.lookahead_on)
xLowD  = request.security(syminfo.tickerid,"W", low[1], lookahead=barmerge.lookahead_on)
pos=0
// This is code from pine v2
// sigpre1 = iff(xHigh <= xLowD, -1,
//   iff(xLow >= xHighD, 1, nz(pos[1], 0)))
sigpre1 = xHigh <= xLowD ? -1 : xLow >= xHighD ? 1 : nz(pos[1], 0)
// This is code from pine v2
// sigpre2 = iff( xHigh <= xHighD, -1,
//   iff(xLow >= xLowD, 1, nz(pos[1], 0)))
sigpre2 = xHigh <= xHighD ? -1 : xLow >= xLowD ? 1 : nz(pos[1], 0)
pos := SigVal ? sigpre1 : sigpre2
// This is code from pine v2
// possig = iff(reverse and pos == 1, -1,
//   iff(reverse and pos == -1, 1, pos))
possig = reverse and pos == 1 ? -1 : reverse and pos == -1 ? 1 : pos

if (possig == 1) 
strategy.entry("Long", strategy.long)
if (possig == -1)
strategy.entry("Short", strategy.short)

barcolor(possig == -1 ? color.red : possig == 1 ? color.green : color.blue )
plot(xLowD, color=color.green, title="S", style =plot.style_circles, linewidth = width)
plot(xHighD, color=color.red, title="R", style =plot.style_circles, linewidth = width)