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How to import multiple .csv files at once?
...iple data.csv files, each containing the same number of variables but each from different times.
Is there a way in R to import them all simultaneously rather than having to import them all individually?
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Using app.configure in express
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Be aware that app.configure is completely removed from version 4.0! github.com/visionmedia/express/issues/936
– Ilan Frumer
May 1 '14 at 6:21
2
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Is there a common Java utility to break a list into batches?
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Check out Lists.partition(java.util.List, int) from Google Guava:
Returns consecutive sublists of a list, each of the same size (the final list may be smaller). For example, partitioning a list containing [a, b, c, d, e] with a partition size of 3 yields [[a, b, c], [...
Error to run Android Studio
.../usr/lib/jvm/java-8-oracle
You will then have to reboot, you can do this from the terminal with:
sudo reboot
In case you want to remove the JDK
sudo apt-get remove oracle-java8-installer
share
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Cassandra port usage - how are the ports used?
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For posterity, this annoyance should be fixed, from Cassandra 2.0.8 onward according to this ticket. The default cassandra-env.sh now sets the com.sun.management.jmxremote.rmi.port property to the same value as the main JMX port so that random ports are not used.
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Why do we need virtual functions in C++?
...you overload func() so it takes a Cat*? If you have to derive more animals from Animal they would all need their own func().
The solution is to make eat() from the Animal class a virtual function:
class Animal
{
public:
virtual void eat() { std::cout << "I'm eating generic food."...
What causes imported Maven project in Eclipse to use Java 1.5 instead of Java 1.6 by default and how
...in doesn't use Eclipse defaults, the m2eclipse plugin derives the settings from the POM. So if you want a Maven project to be configured to use Java 1.6 settings when imported under Eclipse, configure the maven-compiler-plugin appropriately, as I already suggested:
<plugin>
<groupId>o...
Creating an abstract class in Objective-C
...on of an abstract class, however. In fact, there is nothing to stop a user from providing implementations of abstract methods via a category (i.e. at runtime). You can force a user to at least override certain methods by raising an exception in those methods implementation in your abstract class:
[...
How would you access Object properties from within an object method? [closed]
What is the "purist" or "correct" way to access an object's properties from within an object method that is not a getter/setter method?
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How to restart Activity in Android
...cause of "aesthetic" reason is, well, not great. I would discourage anyone from doing it here at Stackoverflow...
– ChuongPham
Aug 8 '13 at 14:27
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