packages | 易学教程

host database with do-nothing app so lite and pro can access

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问题 Like many others, I will have a "lite" and a "pro" version of my app. They use a database, which will be in the internal storage. I would like a user to be able to buy the pro version and install it without losing the database. Partial Solution: I've seen other posts on how to have multiple apps use the same database. Essentially, this requires two things: both manifests declare the same android:sharedUserId in the manifest, one of the apps must open the database using the other app's context

What should be my python packages path for a user install on MacOS?

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问题 I'm on Mac OS X and I've heard that to avoid global installation of packages (using sudo) that might cause problems with the python files that OS X uses, the path to install python packages must be different than that of OS X. Currently python executables are installed in : /usr/local/bin/ Pip installs modules over here : /usr/local/lib/python2.7/site-packages Python is used from here : /usr/local/bin/python Are these paths safe? 回答1: If you are on OS X, you should also have Python in /usr

Error with insertSource(): “object '.cacheOnAssign' not found”

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问题 I am trying to use the function insertSource (new in R 2.12) to update a function that I have made changes on. However, when I use the function in this way: insertSource('filename.R', package = 'mypackage') I get the error: Error in get(this, envir = envp) : object '.cacheOnAssign' not found Unfortunately I can not come up with a simple reproducible example - if one would be helpful, please suggest how I can do it - but I have found that the following code does work: system("echo 'nls <-

package ‘diamonds’ is not available (for R version 3.0.0) [duplicate]

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问题 This question already has answers here : How should I deal with “package 'xxx' is not available (for R version x.y.z)” warning? (15 answers) Closed 5 years ago . what is the easy way to have diamonds package/dataset in my R environment. I am newbie using RStudio (3.0) > install.packages("diamonds") Warning in install.packages : package ‘diamonds’ is not available (for R version 3.0.0) Warning in install.packages : package ‘diamonds’ is not available (for R version 3.0.0) I donot want to

Notes-这两天要连的数据库！ sql server & oracle

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三个步骤： Step 1-创建ODBC数据源； Step 2-install.packages('RODBC') ； Step 3-编写连接测试脚本（1）创建ODBC数据源控制面板->系统和安全->管理工具->ODBC数据源（64位）->系统DSN，点击添加按钮，接着选择安装数据源驱动程序 SQL Server，点击完成填写名称和服务器，名称用于R连接需要用到的database，比如这里填入myData， sqlserver的服务器名可以在登陆sqlserver的可视化界面那里找到接着用户身份连接sqlserver 点击【测试数据源】测试成功之后，完成创建ODBC数据源，继续下一步！（2）在RStudio的Console，install.packages('RODBC') > install.packages('RODBC') Installing package into ‘C:/Users/lmei/Documents/R/win-library/3.5’ (as ‘lib’ is unspecified) trying URL 'https://cran.rstudio.com/bin/windows/contrib/3.5/RODBC_1.3-15.zip' Content type 'application/zip' length 879575 bytes

How do I use the new 'ByteCompile' field in R-2.14?

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问题 I would like to the use the 'ByteCompile' field in R 2.14. However, "Writing R Extensions" only describes this field, but does not say what value it should be set to. How should i use it? Do you have examples? Is it the same as "LazyData: yes"? I also asked this question on the r-devel mailinglist. 回答1: It's a boolean value. Set it to TRUE or FALSE . If you do not specify it in the DESCRIPTION file then it defaults to FALSE . For convenience you could alternatively use yes or no for these

Split packages in plain java

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问题 OSGi has a problem with split packages, i.e. same package but hosted in multiple bundles. Are there any edge cases that split packages might pose problems in plain java (without OSGi) ? Just curious. 回答1: For OSGi packages in different bundles are different, regardless of their name, because each bundle uses its own class loader. It is not a problem but a feature, to ensure encapsulation of bundles. So in plain Java this is normally not a problem, until you start using some framework that

Android_开机动画

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Android_开机动画平台：全志A64 源码： Android 7.1 　Linux 3.1 全志开机动画： 1. bootanimation.zip内容和制作 2. 原生Android系统中好像没有bootanimation.zip, 可以把bootanimation.zip文件放到设备system/media目录下（需要root权限）。放到此目录下后，开机会自动加载该文件里的图片，作为动画。 3. bootanimation.zip 文件内容： —— part0 part1 part2 .... xxx.png <文件夹是png格式图片，也就是“动画”了> —— desc.txt ： 720 450 30 <第一行 720 450 30 前面两个数据代表像素,即:720 * 450;第三位代表每秒播放多少帧，即每秒播放30张图片> c 1 30 part0 <第二行第一个字母 “c”不知道什么玩意儿,固定以他为开头, 第二个数字“3”或者“0”，代表重复播放多少次，"3”即播放3次，但是“0”则代表无限循环播放，(应该是直到代码里面设置的动画时间耗完为止) 第三个数字“0”代标的是前后两帧之间间隔时间/帧数（比如每秒播放10帧，如果这个数字设为10，则延迟1秒了，待确认第四个参数，这就是上文说到的和文件夹名称对应的了，如果是folder～则文件夹名称也是这个，我的5

Why can you import a package after using its content in a function?

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问题 I'm on MATLAB R2014b and have a question that I will illustrate with the following example. MWE can be made as follows or download it as a .zip file here. Create a package folder +test on your path with four function files in it: +test a.m b.m c.m d.m Content of a.m : function a disp 'Hello World!' Content of b.m : function b a If you run b from the command line, you will have to import the test package first ( import test.* ) or run test.b . Running b will result in an error, since the scope

Building Application Packages with multple packages and references in Mathematica

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I am building an application package in Mathematica. The application contains multiple packages and refers to other application packages To set everything up, I have used and followed the application packages instructions of the help section of workbench which is also available at: http://reference.wolfram.com/workbench/index.jsp?topic=/com.wolfram.eclipse.help/html/tasks/applications/introduction.html under the Packages and Applications subsection but... I have implemented and tested single package application packages and the all seem to work fine. My Multiple packages and application is not