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Google Guice vs. PicoContainer for Dependency Injection
...ues and a few pages don't work at all. It looks like the pages were auto-converted from the older content.
http://picocontainer.codehaus.org/ Which seems frozen in time at version 2.10.2 - It would be really nice if the pages said something like "hey, you're looking at an old web site!"
http://doc...
add a string prefix to each value in a string column using Pandas
...
If you load you table file with dtype=str
or convert column type to string df['a'] = df['a'].astype(str)
then you can use such approach:
df['a']= 'col' + df['a'].str[:]
This approach allows prepend, append, and subset string of df.
Works on Pandas v0.23.4, v0.24.1. ...
How to fix corrupted git repository?
... DropBox, SpiderOak, or any other cloud disk), you can do the following:
Convert your .git folder into a single "bundle" git file by using: git bundle create my_repo.git --all, then it should work just the same as before, but since everything is in a single file you won't risk the synchronization ...
Mean per group in a data.frame [duplicate]
...0.33333
#3 Cat 2 44.66667 54.00000
Using data.table:
# At first, I convert the data.frame to data.table and then I group it
setDT(d)
d[, .(Rate1 = mean(Rate1), Rate2 = mean(Rate2)), by = .(Name)]
# Name Rate1 Rate2
#1: Aira 16.33333 47.00000
#2: Ben 31.33333 50.33333
#3: Cat 44.66...
How does RewriteBase work in .htaccess
...s a real rule I used to ensure that URLs have a trailing slash. This will convert
http://www.example.com/~new/page
to
http://www.example.com/~new/page/
By having the RewriteBase there, you make the relative path come off the RewriteBase parameter.
...
Linq to Sql: Multiple left outer joins
...where you'd be better off using DataContext.ExecuteCommand(...) instead of converting to linq.
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Why is the Java main method static?
...ntire class - sometimes you have an instance that hasn't been initialized, and you have to check for it in every method that could be called.
There are just too many edge cases and ambiguities for it to make sense for the JVM to have to instantiate a class before the entry point is called. That's ...
Which concurrent Queue implementation should I use in Java?
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Basically the difference between them are performance characteristics and blocking behavior.
Taking the easiest first, ArrayBlockingQueue is a queue of a fixed size. So if you set the size at 10, and attempt to insert an 11th element, the insert statement will block until another thread remove...
Why do we need a pure virtual destructor in C++?
I understand the need for a virtual destructor. But why do we need a pure virtual destructor? In one of the C++ articles, the author has mentioned that we use pure virtual destructor when we want to make a class abstract.
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Is there a difference between foreach and map?
...eturns another list of the same size with the transformed members (such as converting a list of strings to uppercase)
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