如何将当前数组与 Tradingview Pinescript 中的最后一个数组进行比较？

如何解决如何将当前数组与 Tradingview Pinescript 中的最后一个数组进行比较？

我刚开始编写代码，需要数组方面的帮助！

我想知道如何让这段代码画线仅以防万一

当前红线起点等于或小于最后一条红线起点

提前致谢！

//@version=4
study("zigzag trial",overlay = true)
prd = input(defval = 4,title="zigzag Period",minval = 2,maxval = 50)
showzigzag = input(defval = true,title = "Show Zig Zag")
upcol = input(defval = color.lime,title = "zigzag Up Color")
dncol = input(defval = color.red,title = "zigzag Down Color")

float ph = highestbars(high,prd) == 0 ? high : na
float pl = lowestbars(low,prd) == 0 ? low : na
var dir = 0
dir := iff(ph and na(pl),1,iff(pl and na(ph),-1,dir))
var max_array_size = 10
var zigzag = array.new_float(0)

add_to_zigzag(value,bindex)=>
    array.unshift(zigzag,bindex)
    array.unshift(zigzag,value)
    if array.size(zigzag) > max_array_size
        array.pop(zigzag)
        array.pop(zigzag)
    
update_zigzag(value,bindex)=>
    if array.size(zigzag) == 0
        add_to_zigzag(value,bindex)
    else
        if (dir == 1 and value > array.get(zigzag,0)) or (dir == -1 and value < array.get(zigzag,0))
            array.set(zigzag,value)
            array.set(zigzag,bindex)
        0.
Round_it(value)=> round(value / syminfo.mintick) * syminfo.mintick

dirchanged = change(dir)
if ph or pl
    if dirchanged
        add_to_zigzag(dir == 1 ? ph : pl,bar_index)
    else
        update_zigzag(dir == 1 ? ph : pl,bar_index)
        
        
if showzigzag and array.size(zigzag) >= 4
    var line zzline = na
    float val = array.get(zigzag,0)
    int point = round(array.get(zigzag,1))
    if change(val) or change(point)
        float val1 = array.get(zigzag,2)
        int point1 = round(array.get(zigzag,3))
        if change(val1) == 0 and change(point1) == 0
            line.delete(zzline)
        zzline := line.new(x1 = point,y1 = val,x2 = point1,y2 = val1,color = dir == 1 ? upcol : dncol,width = 2)