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Prepend a level to a pandas MultiIndex
...I think this is a more general solution:
# Convert index to dataframe
old_idx = df.index.to_frame()
# Insert new level at specified location
old_idx.insert(0, 'new_level_name', new_level_values)
# Convert back to MultiIndex
df.index = pandas.MultiIndex.from_frame(old_idx)
Some advantages over t...
How to declare a global variable in a .js file
...
Just define your variables in global.js outside a function scope:
// global.js
var global1 = "I'm a global!";
var global2 = "So am I!";
// other js-file
function testGlobal () {
alert(global1);
}
To make sure that this works you have to include/link to global.j...
How to declare std::unique_ptr and what is the use of it?
...t> p = make_unique<int>(42);
// Going out of scope...
}
// I did not leak my integer here! The destructor of unique_ptr called delete
Now unique_ptr is a smart pointer that models unique ownership, meaning that at any time in your program there shall be only one (owning) pointer to th...
The purpose of Model View Projection Matrix
...an u suggest any sample code for pan functionality in Opengl Es2.0 in Android using this Model View Projection Matrix if Possible. I refereed more links, i could not get any clear idea.if any sample code means, its easy to understand for me..
– harikrishnan
Jun...
JavaScript function order: why does it matter?
...ubbish.
Function hoisting is a feature in JavaScript because it is a good idea.
When you have an internal function which is often the utility of inner functions, adding it to the beginning of the outer function is an acceptable style of writing code, but it does have the drawback that you have to...
Named regular expression group “(?Pregexp)”: what does “P” stand for?
... mine: I've always thought it stood for Python. That may sound pretty stupid -- what, P for Python?! -- but in my defense, I vaguely remembered this thread [emphasis mine]:
Subject: Claiming (?P...) regex syntax extensions
From: Guido van Rossum (gui...@CNRI.Reston.Va.US)
Date: Dec 1...
Cancellation token in Task constructor: why?
...sitioning to
Running, it'll immediately transition to Canceled. This avoids the
costs of running the task if it would just be canceled while running
anyway.
If the body of the task is also monitoring the cancellation token and throws an OperationCanceledException containing that token
(wh...
How to create a density plot in matplotlib?
...you generated with R. This is because gaussian_kde tries to infer the bandwidth automatically. You can play with the bandwidth in a way by changing the function covariance_factor of the gaussian_kde class. First, here is what you get without changing that function:
However, if I use the following...
Java optional parameters
...the parameter.
private boolean defaultOptionalFlagValue = true;
public void doSomething(boolean optionalFlag) {
...
}
public void doSomething() {
doSomething(defaultOptionalFlagValue);
}
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Why are local variables not initialized in Java?
...le and it should not take a default value. If the programmer, by mistake, did not initialize a local variable and it take default value, then the output could be some unexpected value. So in case of local variables, the compiler will ask the programmer to initialize with some value before they acces...