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Efficient way to apply multiple filters to pandas DataFrame or Series
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How does a Breadth-First Search work when looking for Shortest Path?
..., and the preceding node in the shortest path. Initially all distances are set to infinity, and all predecessors are set to empty. In your example, you set A's distance to zero, and then proceed with the BFS. On each step you check if you can improve the distance of a descendant, i.e. the distance f...
Why does Double.NaN==Double.NaN return false?
I was just studying OCPJP questions and I found this strange code:
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Is Big O(logn) log base e?
For binary search tree type of data structures, I see the Big O notation is typically noted as O(logn). With a lowercase 'l' in log, does this imply log base e (n) as described by the natural logarithm? Sorry for the simple question but I've always had trouble distinguishing between the different...
How to convert a std::string to const char* or char*?
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Given C++03's .c_str()'s guarantees about the returned buffer are a super-set of .data()'s, you can always safely use .c_str(), but people sometimes don't because:
using .data() communicates to other programmers reading the source code that the data is not ASCIIZ (rather, you're using the string ...
Passing by reference in C
If C does not support passing a variable by reference, why does this work?
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Integrating the ZXing library directly into my Android application
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try {
Bitmap bitmap = qrCodeEncoder.encodeAsBitmap();
imageView.setImageBitmap(bitmap);
} catch (WriterException e) {
e.printStackTrace();
}
Here is Contents.java
//
// * Copyright (C) 2008 ZXing authors
// *
// * Licensed under the Apache License, Version 2.0 (the "License");
// ...
Emulate ggplot2 default color palette
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Static methods in Python?
...even is actually right. To answer the original question, then, in order to set up a class method, simply assume that the first argument is not going to be a calling instance, and then make sure that you only call the method from the class.
(Note that this answer refers to Python 3.x. In Python 2.x ...
Get specific line from text file using just shell script
I am trying to get a specific line from a text file.
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