openstack和hadoop的区别是什么？（一）openstack仿照的Amazon的云，hadoop仿照的是Google的云openstack注重的是虚拟化/虚拟机及其配套的服务，hadoop注重的是海量的数据分析和处理。（二）2OpenStack主要目的是做一整套的云计算基础构架。包括云计算(Compute),网络(Network)，对象存贮(ObjectStore)，镜像文件存储(Image)，身份认证(Authentication)，Block
系统 2019-08-12 09:27:35 3294
Python==3.7.x有两种方式实现计划任务:scheduleAPscheduler打包python程序定时器:scheduleimportscheduleimporttime,datetimedeftask(name):print("{0}".format(name))#每隔2秒执行一次任务schedule.every(2).seconds.do(task,name)#每隔一小时执行一次任务schedule.every().hour.do(task,
系统 2019-09-27 17:57:38 3293
如下所示：importmatplotlib.pyplotaspltimportnumpyasnpfromscipyimportstatsfrommatplotlibimportstylestyle.use('fivethirtyeight')mu_params=[-1,0,1]sd_params=[0.5,1,1.5]x=np.linspace(-7,7,100)f,ax=plt.subplots(len(mu_params),len(sd_params)
系统 2019-09-27 17:56:00 3293
WSWinForm.exe介绍WSWinForm.exe是我自己开发的一个实用的小工具，用于将任何EXE程序作为Windows服务运行。也就是说WSWinForm只是其注册程序的服务外壳，这个特性对于我们来说非常实用，我们可以通过它来安装，运行，停止，卸载Windows服务，而不再是通过命令行InstallUtil的方式来安装。资源下载你可以通过本文下载。应用程序源代码如何使用下载完软件以后，我们能干些什么呢？看看这个截图吧：。这里可以看到的操作：1.安装
系统 2019-08-29 23:02:36 3293
iOS中编码转化1.UTF-8转化NSString*data=@"你好，北京！";//转换成UTF-8NSString*dataUTF8=[datastringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];NSLog(@"%@",dataUTF8);//UTF-8转GBK,将UTF8代码替换，官方解释如下。//Replacesallpercentescapeswiththematchin
系统 2019-08-29 22:50:23 3293
前言上一篇文章，我们讲解了边缘梯度计算函数，这篇文章我们来了解图像金字塔。图像金字塔？图像金字塔被广泛用于计算机视觉应用中。图像金字塔是一个图像集合，集合中所有的图像都源于同一个原始图像，而且是通过对原始图像连续降采样获得的。——《学习OpenCV》常见的图像金字塔有下面两种：高斯金字塔(Gaussianpyramid):用来向下采样拉普拉斯金字塔(Laplacianpyramid):用来从金字塔低层图像重建上层未采样图像高斯金字塔类似金字塔一样，高斯金字
系统 2019-08-12 01:33:37 3293
在我那篇《浅析C++中的this指针》中，我通过分析C++代码编译后生成的汇编代码来分析this指针的实现方法。这次我依然用分析C++代码编译后生成的汇编代码来说明C++中虚函数调用的实现方法，顺便也说明一下C++中的对象内部布局。下面所有的汇编代码都是用VC2005编译出来的。虽然，不同的编译器可能会编译出不同的结果，对象的内部布局也不尽相同；但是，只要是符合C++标准的编译器，编译结果和对象的内部布局应该是大同小异。首先，是一个有着简单继承关系的两个类
系统 2019-08-29 23:30:45 3292
概览无论当前JavaScript代码是内嵌还是在外链文件中，页面的下载和渲染都必须停下来等待脚本执行完成。JavaScript执行过程耗时越久，浏览器等待响应用户输入的时间就越长。浏览器在下载和执行脚本时出现阻塞的原因在于，脚本可能会改变页面或JavaScript的命名空间，它们对后面页面内容造成影响。一个典型的例子就是在页面中使用document.write()。例如清单1清单1JavaScript代码内嵌示例Sou</span>
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<a class="zj-titles zj-del-target" href="/article/737" title="vim——vim配置步骤" target="_blank" onclick="return recordId('',)">vim——vim配置步骤 </a>
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<span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/737';}else{window.open('/article/737');}" style="cursor: pointer;">1.直接到githubhttps://github.com/lucasysfeng/k-vim依照README.md步骤配置。2.注意gitclone的地址为https://github.com/lucasysfeng/k-vim.git配置步骤clone到本地,配置到linux个人目录（如果是从linux_config过来的，不需要clone）gitclonehttps://github.com/lucasysfeng/k-vim.git安装依赖包#ub</span>
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<span class="muted"><i class="fa fa-user"></i><span class="zj-icon-text">系统</span></span> <span class="muted"><i class="fa fa-clock-o"></i><span class="zj-icon-text">2019-08-12 01:32:13</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3292</span></span>
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<a class="zj-titles zj-del-target" href="/article/420" title="Javascript图像处理——阈值" target="_blank" onclick="return recordId('',)">Javascript图像处理——阈值 </a>
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<span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/420';}else{window.open('/article/420');}" style="cursor: pointer;">前言上一篇文章，我们讲解了图像处理中的亮度和对比度的变化，这篇文章我们来做一个阈值函数。最简单的图像分割方法阈值是最简单的图像分割方法。比如为了从下图中分割出苹果，我们利用前景与背景的灰度差值，通过设定一个阈值，对于该像素大于这个阈值时就以黑色表示，小于便以灰色表示。五种阈值类型和OpenCV一样，我们将提供五种阈值类型，方便使用。下面是原图像的波形表示，纵坐标表示像素点的灰度值大小，蓝线是阈值大小。二进制阈值化公式表示是：图像表示是：可见超过该阈值的就变</span>
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