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IPN vs PDT in Paypal
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edited Mar 13 '15 at 20:23
Rafael
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Why java.util.Optional is not Serializable, how to serialize the object with such fields
...excellent blog post on the rationale behind Sutart's answer: blog.joda.org/2014/11/optional-in-java-se-8.html
– Wesley Hartford
Jan 30 '15 at 15:10
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Installing older version of R package
...ea, but is also subject to needing Rtools on Windows.
As of September 18, 2015, a new package versions has appeared on CRAN. This relies on the Revolution Analytics MRAN server to install packages for specific versions or dates:
# install yesterday's version of checkpoint, by date
install.dates('c...
How to remove a field completely from a MongoDB document?
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Suman Kundu
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answered Nov 10 '13 at 7:31
Salvador DaliSalvador Dali
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How to export all collections in MongoDB?
...ngorestore for big data storages. It is very slow and once you get past 10/20GB of data it can take hours to restore.
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How could I convert data from string to long in c#
... That is correct.... this no longer seems to work, as it did on 2013. I'll post an update shortly.
– Will Bellman
Jul 23 at 18:09
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How to avoid variable substitution in Oracle SQL Developer with 'trinidad & tobago'
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edited Oct 13 '18 at 20:13
answered Oct 8 '18 at 5:51
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How to make gradient background in android
... background of some view. For example:
<View
android:layout_width="200dp"
android:layout_height="100dp"
android:background="@drawable/my_gradient_drawable"/>
type="linear"
Set the angle for a linear type. It must be a multiple of 45 degrees.
<gradient
android:type="line...
What is a monad?
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edited Apr 19 '17 at 20:50
community wiki
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我帮儿子用App Inventor 2给遥控车装了"蓝牙大脑"，手机一划车就...
...发现——HC-05默认波特率是9600，而Arduino代码里写的是115200。改成9600后瞬间连通。
坑2：指令多了车会卡顿
一开始每10ms发一次指令，结果Arduino缓冲区溢出。把发射间隔调到100ms，同时接收端加了个简单的滑动平均滤波，操控...