mean

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: Example: 0:074> !address -summary --- Usage Summary ---------------- RgnCount ----------- Total Size -------- %ofBusy %ofTotal Free 90919 7ec`34659000 ( 7.923 Tb) 99.03% <unclassified> 95426 12`3c3e9000 ( 72.941 Gb) 92.12% 0.89% Heap 744 1`7ee50000 ( 5.983 Gb) 7.56% 0.07% Image 4303 0`0f890000 ( 248.563 Mb) 0.31% 0.00% Stack 225 0`00de9000 ( 13.910 Mb) 0.02% 0.00% TEB 75 0`00096000 ( 600.000 kb) 0.00% 0.00% ActivationContextData 28 0`00025000 ( 148.000 kb) 0.00% 0.00% NlsTables 1 0`00023000 ( 140.000 kb) 0.00% 0.00% CsrSharedMemory 1 0

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I have a dataset named bwght which contains the variable cigs (cigarattes smoked per day) When I calculate the mean of cigs in the dataset bwght using: mean(bwght$cigs) , I get a number 2.08. Only 212 of the 1388 women in the sample smoke (and 1176 does not smoke): summary(bwght$cigs>0) gives the result: Mode FALSE TRUE NA's logical 1176 212 0 I'm asked to find the average of cigs among the women who smoke (the 212). I'm having a hard time finding the right syntax for excluding the non smokers = 0 I have tried: mean(bwght$cigs| bwght$cigs>0)

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 由 翻译 强力驱动 问题: We've turned on verbose GC logging to keep track of a known memory leak and got the following entries in the log: ... 3607872.687 : [ GC 471630K -> 390767K ( 462208K ), 0.0325540 secs ] 3607873.213 : [ GC -- 458095K -> 462181K ( 462208K ), 0.2757790 secs ] 3607873.488 : [ Full GC 462181K -> 382186K ( 462208K ), 1.5346420 secs ] ... I understand the first and third of those, but what does the "GC--" one mean? 回答1: I got these kind of lines in my gc output: 44871.602 : [ GC -- [ PSYoungGen : 342848K -> 342848K ( 345600K )] 961401K ->

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 由 翻译 强力驱动 问题: I have a question which is connected to this one, which I asked previously: Assignment of a value from a foreach loop . I found out that although the solutions I was provided by friendly users point into the right direction they don't solve my actual problem. Here the sample data set: td <- data . table ( date = c ( rep ( 1 , 10 ), rep ( 2 , 10 )), var = c ( rep ( 1 , 4 ), 2 , rep ( 1 , 5 )), id = rep ( 1 : 10 , 2 )) It is the same as before, but it reflects my real data better What I want to do in words: For each id I want to have

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: Since I am fairly new to R, I do not know what the S3 methods and objects are. I found that there are S3 and S4 object systems, and some recommend to use S3 over S4 if possible ( http://google-styleguide.googlecode.com/svn/trunk/google-r-style.html ). However, I do not know the exact definition of S3 methods/objects. 回答1: Most of the relevant information can be found by looking at ?S3 or ?UseMethod , but in a nutshell: S3 refers to a scheme of method dispatching. If you've used R for a while, you'll notice that there are print , predict and

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I have this macro, which rewrites define. If I remove the " ` " backtick it won't work. What is the explanation? (defmacro define ((name &rest r) body) `(defun ,name ,r ,body)) 回答1: A single quote followed by the written representation of a value will produce that value: Example: '(1 x "foo") will produce a value that prints as (1 x "foo") . Suppose now that I don't want a literal symbol x in the list. I have a variable x in my program, and I want to insert the value to which x . To mark that I want the value of x rather than the symbol x ,

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: Lets say I have r = pd.DataFrame({'A':1 , 'B':pd.Series(1,index=list(range(4)),dtype='float32')}) And r['B'].describe()[['mean','std','min','max']] gives an output : mean 1.0 std 0.0 min 1.0 max 1.0 Name: B, dtype: float64 But from the above output , how should I get rid or suppress the last line " Name:B, dtype: float64 " I figured out one way to achieve this x=r['B'].describe()[['mean','std','min','max']] print "mean ",x['mean'],"\nstd ",x['std'],"\nmin ",x['min'],"\nmax ",x['max'] which gives the desired output : mean 1.0 std 0.0 min 1.0

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I found this code in a RailsCast : def tag_names @tag_names || tags.map(&:name).join(' ') end What does the (&:name) in map(&:name) mean? 回答1: It's shorthand for tags.map(&:name.to_proc).join(' ') If foo is an object with a to_proc method, then you can pass it to a method as &foo , which will call foo.to_proc and use that as the method's block. The Symbol#to_proc method was originally added by ActiveSupport but has been integrated into Ruby 1.8.7. This is its implementation: class Symbol def to_proc Proc.new do |obj, *args| obj.send self,

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: Docker daemon documentation suggests the following hosts option for most setups: dockerd -H fd:// I guess fd stands for file descriptor. I don't understand how fd is used for socket communication. I understand the following options: -H unix:///var/run/docker.sock -H tcp://192.168.59.106 -H tcp://10.10.10.2 These are unix domain sockets and tcp sockets. I know how to call docker daemon using these sockets: docker -H tcp://0.0.0.0:2375 ps But if I started docker daemon using -H fd:// , the following call gives error: $ docker -H fd:// ps error

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: This is my first venture into parallel processing and I have been looking into Dask but I am having trouble actually coding it. I have had a look at their examples and documentation and I think dask.delayed will work best. I attempted to wrap my functions with the delayed(function_name), or add an @delayed decorator, but I can't seem to get it working properly. I preferred Dask over other methods since it is made in python and for its (supposed) simplicity. I know dask doesn't work on the for loop, but they say it can work inside a loop. My