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Use the object construct when you need a class with a single instance, or when you want to find a home for miscellaneous values or functions. Singleto 阅读全文
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Simple Classes and Parameterless Methods In Scala, a class is not declared as public . A Scala source file can contain multiple classes, and all of th 阅读全文
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Constructing a Map The value of "Alice" -> 10 is ("Alice", 10). You could have equally well defined the map as Accessing Map Values To check whether t 阅读全文
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Fixed-Length Arrays Variable-Length Arrays: Array Buffers Traversing Arrays and Array Buffers The variable i goes from 0 to a.length - 1 . To visit ev 阅读全文
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An expression has a value; a statement carries out an action. Conditional Expressions: IF-ELSE In Scala, an if / else has a value. For example: if (x 阅读全文
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Interpreter Values and Variables You are encouraged to use a val unless you really need to change the contents. The type of a variable or function is 阅读全文
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A Markov chain is a stochastic process where we transition from one state to another state using a simple sequential procedure. We start a Markov chai 阅读全文
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The application of probabilistic models to data often leads to inference problems that require the integration of complex, high dimensional distributi 阅读全文
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1.2.1 Inverse transform sampling(ITS) with discrete variables This method generates random numbers from any probability distribution given the inverse 阅读全文
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Matlab built-in distributions are all standard distributions, See the summarization below. Solutions for 1.1. I‘ve implemented those distributions: il 阅读全文
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public class ToBeBuilt { private final int age; private final int safeID; private final String name; private final String address; public int getAge() { re... 阅读全文
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//Count.java public interface Count { public int add(int a, int b); } // CountImpl.java public class CountImpl implements Count{ @Override public int add(int a, int b) { // T... 阅读全文
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One important thing to understand is that after extracting the keypoints, you only obtain information abouttheir position, and sometimes their coverag 阅读全文
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-l参数就是用来指定程序要链接的库,-l参数紧接着就是库名,那么库名跟真正的库文件名有什么关系呢?就拿数学库来说,他的库名是m,他的库文件名是libm.so,很容易看出,把库文件名的头lib和尾.so去掉就是库名了 好了现在我们知道怎么得到库名,当我们自已要用到一个第三方提供的库名字libtest. 阅读全文
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独立分布是指的扰动项之间相互独立。这样扰动项的相关阵表现为一个对角阵,且对角线上的值为1,其他为0。平稳性一般在时序中提的比较多,这时不要求扰动项之间不相关,只要求它们之间的相关性是随着时间衰减的,也就是不存在单位根。这时,在大样本下仍可以保证估计结果是一致的。所以平稳性比独立性对数据的要求要低一些 阅读全文
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Install and Update R If we want to update R from version A to version B, then we can Install R Packages (1)Enter into R environment $>R (2)Set the wor 阅读全文
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(1)I spent my 4th year Computing project on implementing time series forecasting for Java heap usage prediction using ARIMA, Holt Winters etc, so I mi... 阅读全文
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Install Ant: download the ant package Install Ivy: download the latest Ivy package "apache-ivy-2.4.0-rc1-bin.tar.gz" and unpack it shows: and then cop 阅读全文
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Alpha Channel Support OpenCV 不支持 alpha channel, 只支持masking;但是BufferedImage支持alpha。那么怎样获取BufferedImage img 的数据呢?目前有两种方法: (1)img.getRGB(0, 0, w, h, pixe 阅读全文
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很多开发者谈到Java多线程开发,仅仅停留在newThread(...).start()或直接使用Executor框架这个层面,对于线程的管理和控制却不够深入,通过读《Java并发编程实践》了解到了很多不为我知但又非常重要的细节,今日整理如下。不应用线程池的缺点有些开发者图省事,遇到需要多线程处理的地方,直接newThread(...).start(),对于一般场景是没问题的,但如果是在并发请求很高的情况下,就会有些隐患:·新建线程的开销。线程虽然比进程要轻量许多,但对于JVM来说,新建一个线程的代价还是挺大的,决不同于新建一个对象·资源消耗量。没有一个池来限制线程的数量, 阅读全文