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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 data.frame like this: df <- read . csv ( text = "ONE,TWO,THREE 23,234,324 34,534,12 56,324,124 34,234,124 123,534,654" ) I want to produce a percent bar plot which looks like this (made in LibreOffice Calc): Thus, the bars should be standarized so all stacks have the same height and sums to 100%. So far all I have been able to get is is a stacked barplot (not percent), using: barplot ( as . matrix ( df )) Any help? 回答1: Since you tagged this with ggplot2 here's a solution using that package (version 0.9.0) in addition to

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'm using rails 3.2 and devise 2.0 and I'm quite new to Rails. Requirements I'd like to achieve the following: have 2 or more "user" models, eg. Member, Customer, Admin all models share some required fields (eg. email and password) each model may have some unique fields (eg. company for Customer only) some fields may be shared but not have the same validation (eg. name is required for Customer but optional for Member) all fields must be filled during the registration process, so the forms are different the login form should be unique

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 am just starting to use RabbitMQ and AMQP in general. I have a queue of messages I have multiple consumers, which I would like to do different things with the same message . Most of the RabbitMQ documentation seems to be focused on round-robin, ie where a single message is consumed by a single consumer, with the load being spread between each consumer. This is indeed the behavior I witness. An example: the producer has a single queue, and send messages every 2 sec: var amqp = require('amqp'); var connection = amqp.createConnection({ host:

------转载 路修远而求索 （ https://www.cnblogs.com/keyi/p/5821668.html ） Map是java中的接口，Map.Entry是Map的一个内部接口。 Map提供了一些常用方法，如keySet()、entrySet()，values()等方法。 keySet()方法返回值是Map中key值的集合； entrySet()的返回值也是返回一个Set集合，此集合的类型为Map.Entry。 Map.Entry是Map声明的一个内部接口，此接口为泛型，定义为Entry<K,V>。它表示Map中的一个实体（一个key-value对）。接口中有getKey(),getValue方法。(entry的英文意思是 “记录“) //由以上可以得出，遍历Map的常用方法： 1. Map map = new HashMap(); Irerator iterator = map.entrySet().iterator(); while(iterator.hasNext()) { Map.Entry entry = iterator.next(); Object key = entry.getKey(); } 2.Map map = new HashMap(); Set keySet= map.keySet(); Irerator iterator =

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 am just starting to use RabbitMQ and AMQP in general. I have a queue of messages I have multiple consumers, which I would like to do different things with the same message . Most of the RabbitMQ documentation seems to be focused on round-robin, ie where a single message is consumed by a single consumer, with the load being spread between each consumer. This is indeed the behavior I witness. An example: the producer has a single queue, and send messages every 2 sec: var amqp = require('amqp'); var connection = amqp.createConnection({ host:

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 would like to know how to loop through each line in a text file using a Windows batch file and process each line of text in succession. 回答1: The posts below helped greatly, but did not do what I stated in my question where I needed to process the entire line as a whole. Here is what I found to work. for /F "tokens=*" %%A in (myfile.txt) do [process] %%A The tokens keyword with an asterisk (*) will pull all text for the entire line. If you don't put in the asterisk it will only pull the first word on the line. I assume it has to do with

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'm looking for a very simple algorithm for computing the polygon intersection/clipping. That is, given polygons P , Q , I wish to find polygon T which is contained in P and in Q , and I wish T to be maximal among all possible polygons. I don't mind the run time (I have a few very small polygons), I can also afford getting an approximation of the polygons' intersection (that is, a polygon with less points, but which is still contained in the polygons' intersection). But it is really important for me that the algorithm will be simple (cheaper

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 found this famous dp problem in many places, but I can not figure out how to solve. You are given a set of n types of rectangular 3-D boxes, where the i^th box has height h(i), width w(i) and depth d(i) (all real numbers). You want to create a stack of boxes which is as tall as possible, but you can only stack a box on top of another box if the dimensions of the 2-D base of the lower box are each strictly larger than those of the 2-D base of the higher box. Of course, you can rotate a box so that any side functions as its base.

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 yet to find a way of setting up Python logging with Django that I'm happy with. My requirements are fairly simple: Different log handlers for different events - that is, I want to be able to log to different files Easy access to loggers in my modules. The module should be able to find its logger with little effort. Should be easily applicable to command-line modules. Parts of the system are stand-alone command line or daemon processes. Logging should be easily usable with these modules. My current setup is to use a logging.conf file

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: As I understand it, the best practice for generating salts is to use some cryptic formula (or even magic constant) stored in your source code. I'm working on a project that we plan on releasing as open source, but the problem is that with the source comes the secret formula for generating salts, and therefore the ability to run rainbow table attacks on our site. I figure that lots of people have contemplated this problem before me, and I'm wondering what the best practice is. It seems to me that there is no point having a salt at all if the