[英]Ruby: Average array of times
I have the following method in my Array
class: 我的
Array
类中有以下方法:
class Array
def avg
if partial_include?(":")
avg_times
else
blank? and 0.0 or (sum.to_f/size).round(2)
end
end
def avg_times
avg_minutes = self.map do |x|
hour, minute = x.split(':')
total_minutes = hour.to_i * 60 + minute.to_i
end.inject(:+)/size
"#{avg_minutes/60}:#{avg_minutes%60}"
end
def partial_include?(search_term)
self.each do |e|
return true if e[search_term]
end
return false
end
end
This works great with arrays of regular numbers, but there could instances where I have an array of times. 这非常适合常规数字数组,但是在某些情况下,我可能会有很多时间。
For example: [18:35, 19:07, 23:09]
例如:
[18:35, 19:07, 23:09]
: [18:35, 19:07, 23:09]
Anyway to figure out the average of an array of time objects? 反正找出时间对象数组的平均值?
So you need do define a function that can calculate the average of times formatted as strings. 因此,您需要定义一个函数,该函数可以计算格式化为字符串的平均时间。 Convert the data to minutes, avg the total minutes and then back to a time.
将数据转换为分钟,平均总分钟数,然后返回一个时间。
I would do it something like this: 我会做这样的事情:
a = ['18:35', '19:07', '23:09']
def avg_of_times(array_of_time)
size = array_of_time.size
avg_minutes = array_of_time.map do |x|
hour, minute = x.split(':')
total_minutes = hour.to_i * 60 + minute.to_i
end.inject(:+)/size
"#{avg_minutes/60}:#{avg_minutes%60}"
end
p avg_of_times(a) # = > "20:17"
Then when you call you function you check if any/all items in your array is formatted as a time. 然后在调用函数时,检查数组中是否有任何/所有项目被格式化为时间。 Maybe using regexp.
也许使用正则表达式。
Here's a simple method that we're using: 这是我们正在使用的一种简单方法:
def calculate_average_of_times( times )
hours = times.collect{ |time| time.split( ":" ).first.to_i } # Large Arrays should only
minutes = times.collect{ |time| time.split( ":" ).second.to_i } # call .split 1 time.
average_hours = hours.sum / hours.size
average_minutes = ( minutes.sum / minutes.size ).to_s.rjust( 2, '0' ) # Pad with leading zero if necessary.
"#{ average_hours }:#{ average_minutes }"
end
And to show it working with your provided Array
of 24-hour times, converted to Strings
: 并显示它如何与您提供的24小时制
Array
一起使用,并转换为Strings
:
calculate_average_of_times( ["18:35", "19:07", "23:09"] )
#=> "20:17"
Thanks to @matt-privman for the help and inspiration on this. 感谢@ matt-privman在此方面的帮助和启发。
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