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Create an index on a huge MySQL production table without table locking
I need to create an index on a ~5M rows MySQL table. It is a production table, and I fear a complete block of everything if I run a CREATE INDEX statement...
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Remap values in pandas column with a dict
I have a dictionary which looks like this: di = {1: "A", 2: "B"}
10 Answers
10
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Performance of foreach, array_map with lambda and array_map with static function
What's the performance difference (if there is any) between these three approaches, both used to transform an array to another array?
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Why does 0.ToString(“#.##”) return an empty string instead of 0.00 or at least 0?
Why does 0.ToString("#.##") return an empty string? Shouldn't it be 0.00 or at least 0 ?
5 Answers
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Is there a way to detect if an image is blurry?
I was wondering if there is a way to determine if an image is blurry or not by analyzing the image data.
12 Answers
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Java: parse int value from a char
I just want to know if there's a better solution to parse a number from a character in a string (assuming that we know that the character at index n is a number).
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How to nicely format floating numbers to String without unnecessary decimal 0?
An 64-bit double can represent integer +/- 2 53 exactly
26 Answers
26
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Generating random whole numbers in JavaScript in a specific range?
How can I generate random whole numbers between two specified variables in JavaScript, e.g. x = 4 and y = 8 would output any of 4, 5, 6, 7, 8 ?
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What are Vertex Array Objects?
I am just starting to learn OpenGL today from this tutorial: http://openglbook.com/the-book/
I got to chapter 2, where I draw a triangle, and I understand everything except VAOs (is this acronym OK?). The tutorial has this code:
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