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$averageArr数组的末尾。
我试图平均一个不断更新的数组的最后五个值，$averageArr所以我想我会让一个变量sum将它设置为零，将最后五个值添加到它，然后将它除以 5 以获得动态和变化平均的。
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）中遇到了困难，其中我收到了关于FixNumand的错误nil：
/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>'
我可能正在尝试访问和索引超出数组的范围，但这似乎不是问题。任何帮助，将不胜感激。