【发布时间】：2016-01-20 17:04:29
【问题描述】：
我正在使用 HTTParty 连接到 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 $averageArr 数组的末尾。
我正在尝试平均一个不断更新的数组$averageArr 的最后五个值，所以我想我应该将变量sum 设置为零，将最后五个值添加到其中，然后除以5 以获得动态变化的平均值。
这是我的代码：
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, #$250.00 -- probably ludicrously high
"qty" => 1,
"direction" => "sell",
"orderType" => "market" # See the order docs for what a limit order is
}
response = HTTParty.post("#{base_url}/venues/#{venue}/stocks/#{stock}/orders",
:body => JSON.dump(order),
:headers => {"X-Starfighter-Authorization" => apikey}
)
end
end
end
我在第 45 行（已评论）遇到问题，其中我收到了关于 FixNum 和 nil 的错误：
/Users/kaichristensen/Dropbox/Kai/Stockfighter/level_three_selling.rb:45:in `+': nil can't be coerced into Fixnum (TypeError)
from /Users/kaichristensen/Dropbox/Kai/Stockfighter/level_three_selling.rb:45:in `block in getAverage'
from /Users/kaichristensen/Dropbox/Kai/Stockfighter/level_three_selling.rb:43:in `each'
from /Users/kaichristensen/Dropbox/Kai/Stockfighter/level_three_selling.rb:43:in `getAverage'
from /Users/kaichristensen/Dropbox/Kai/Stockfighter/level_three_selling.rb:64:in `block in <main>'
from /Users/kaichristensen/Dropbox/Kai/Stockfighter/level_three_selling.rb:62:in `each'
from /Users/kaichristensen/Dropbox/Kai/Stockfighter/level_three_selling.rb:62:in `<main>'
我可能试图在数组的范围之外访问和索引，但这似乎不是问题。任何帮助将不胜感激。
【问题讨论】：
-
你的代码有很多错误。要消除此错误，您可以将
.to_i添加到此行的末尾，如下所示：$averageArr.last.to_i。打赌这对你没有多大帮助。 -
谢谢！我会试试这个！
-
@lurker 看看上一行。
puts永远不会被调用。 -
获得平均值的更短方法：
$averageArr.map(&:to_i).sum / $averageArr.length -
@MaximPontyushenko 哎呀抱歉，是的，你是对的，我的眼睛只关注最后一句话。
标签： arrays ruby for-loop null fixnum