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C++11 emplace_back on vector?
..., ...) it will be considered as regular T{arg0, arg1, ...} that you would expect.
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SQL Joins Vs SQL Subqueries (Performance)?
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I would EXPECT the first query to be quicker, mainly because you have an equivalence and an explicit JOIN. In my experience IN is a very slow operator, since SQL normally evaluates it as a series of WHERE clauses separated by "OR" (W...
Making heatmap from pandas DataFrame
...y as np
from pandas import DataFrame
import matplotlib.pyplot as plt
index = ['aaa', 'bbb', 'ccc', 'ddd', 'eee']
columns = ['A', 'B', 'C', 'D']
df = DataFrame(abs(np.random.randn(5, 4)), index=index, columns=columns)
plt.pcolor(df)
plt.yticks(np.arange(0.5, len(df.index), 1), df.index)
plt.xticks...
How to enter a multi-line command
... or any other kind of parentheses will allow line continuation directly:
$x=1..5
$x[
0,3
] | % {
"Number: $_"
}
Similar to the | a comma will also work in some contexts:
1,
2
Keep in mind, though, similar to JavaScript's Automatic Semicolon Insertion, there are some things that are similar...
ISO time (ISO 8601) in Python
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Here is what I use to convert to the XSD datetime format:
from datetime import datetime
datetime.now().replace(microsecond=0).isoformat()
# You get your ISO string
I came across this question when looking for the XSD date time format (xs:dateTime). I needed t...
Reducing MongoDB database file size
... was once large (>3GB). Since then, documents have been deleted and I was expecting the size of the database files to decrease accordingly.
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Center Oversized Image in Div
...est of the styling used
}
.child {
position: absolute;
top: -9999px;
bottom: -9999px;
left: -9999px;
right: -9999px;
margin: auto;
}
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Meaning of @classmethod and @staticmethod for beginner? [duplicate]
Could someone explain to me the meaning of @classmethod and @staticmethod in python? I need to know the difference and the meaning.
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Disabling implicit animations in -[CALayer setNeedsDisplayInRect:]
I've got a layer with some complex drawing code in its -drawInContext: method. I'm trying to minimize the amount of drawing I need to do, so I'm using -setNeedsDisplayInRect: to update just the changed parts. This is working splendidly. However, when the graphics system updates my layer, it's transi...
How do I install Maven with Yum?
...wards the process is easy
Run the wget command from the dir you want to extract maven too.
run the following to extract the tar,
tar xvf apache-maven-3.0.5-bin.tar.gz
move maven to /usr/local/apache-maven
mv apache-maven-3.0.5 /usr/local/apache-maven
Next add the env variables to your ~/.bas...