Arrays `+'nil不能强制为FixNum（TypeError）不会消失

我正在使用HTTParty连接stockfighter.io的API并获取股票报价，然后从中提取每股价格，并将其附加到$averageArr数组的末尾

我试图平均一个不断更新的数组的最后五个值，$averageArr，所以我想做一个变量和，将它设置为零，将最后五个值相加，然后除以5，得到一个动态变化的平均值

这是我的密码：

require 'rubygems'
require 'httparty'
require 'json'

apikey = 'API_KEY_FOR_LOGIN_HERE'
venue = "VENUEX"
stock = "FOOBAR"

base_url = "https://api.stockfighter.io/ob/api"

account = "MY_ACCOUNT_HERE"

$averageArr = []

$counter = 0

$currAve = 0


def getQuote(stock, venue, account)

    response = HTTParty.get("https://api.stockfighter.io/ob/api/venues/#{venue}/stocks/#{stock}/quote")

    orderbook = response.parsed_response

    puts orderbook["ok"]

    return orderbook["last"]
    puts orderbook["lastTrade"]

end


def getAverage(stock, venue, account)

    $averageArr.push(getQuote(stock, venue, account))
    $counter += 1

    if $counter > 5

        sum = 0

        #line 43
        for i in 1..5 do
            # this one is line 45
            sum += $averageArr[$averageArr.count - i]

        end


        return sum/5
        $currAve = sum/5

    else

        return 'WAITING FOR QUOTE. CURRENT:'

    end
end


# line 62
for i in 1..10 do

    # line 64
    getAverage(stock, venue, account)

    if $counter > 5

        if getQuote(stock, venue, account) < $currAve - 25 and numShares < 999

            order = {

                    "account" => account,
                    "venue" => venue,
                    "symbol" => stock,
                    "price" => 1,  #$250.00 -- probably ludicrously high
                    "qty" => 1,
                    "direction" => "buy",
                    "orderType" => "market"  # See the order docs for what a limit order is

                  }

            response = HTTParty.post("#{base_url}/venues/#{venue}/stocks/#{stock}/orders",
                                   :body => JSON.dump(order),
                                   :headers => {"X-Starfighter-Authorization" => apikey}
                                   )

        elsif getQuote(stock, venue, account) > $currAve + 25 and numShares > 0

            order = {

                    "account" => account,
                    "venue" => venue,
                    "symbol" => stock,
                    "price" => 1,  #$250.00 -- probably ludicrously high
                    "qty" => 1,
                    "direction" => "sell",
                    "orderType" => "market"  # See the order docs for what a limit order is

                  }

            response = HTTParty.post("#{base_url}/venues/#{venue}/stocks/#{stock}/orders",
                                   :body => JSON.dump(order),
                                   :headers => {"X-Starfighter-Authorization" => apikey}
                                   )

        end
    end
end

---

我可能试图在数组的范围外访问和索引，但这似乎不是问题所在。任何帮助都将不胜感激。

您的语法很好。问题是您的方法没有验证数据

a+=b扩展为a=a+b，当b为nil时，将抛出您面临的错误

您需要确保getQuote始终返回一个数字，或者在执行数学运算之前，将任何想要求平均值的内容转换为一个数字

对于前者，您可以将return orderbook[last]更改为return orderbook[last]

---

对于后者，sum+=$averageArr[$averageArr.count-i].to_f

您的代码有很多错误。要消除此错误，可以将.To_i添加到此行末尾，如下所示：$averageArr.last.To_i。我打赌这对你没多大帮助。谢谢！我要试试这个@潜伏者看一看前一行。永远不会调用puts。获取平均值的较短方法：$averageArr.map&:to_i.sum/$averageArr。length@MaximPontyushenko哦，对不起，是的，你是对的，我的眼睛只盯着最后一句话。

/Users/kaichristensen/Dropbox/Kai/Stockfighter/level_three_selling.rb:45:in `+': nil can't be coerced into Fixnum (TypeError)
from /Users/kaichristensen/Dropbox/Kai/Stockfighter/level_three_selling.rb:45:in `block in getAverage'
from /Users/kaichristensen/Dropbox/Kai/Stockfighter/level_three_selling.rb:43:in `each'
from /Users/kaichristensen/Dropbox/Kai/Stockfighter/level_three_selling.rb:43:in `getAverage'
from /Users/kaichristensen/Dropbox/Kai/Stockfighter/level_three_selling.rb:64:in `block in <main>'
from /Users/kaichristensen/Dropbox/Kai/Stockfighter/level_three_selling.rb:62:in `each'
from /Users/kaichristensen/Dropbox/Kai/Stockfighter/level_three_selling.rb:62:in `<main>'