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Finding quaternion representing the rotation from one vector to another
...ware that this does not handle the case of parallel vectors (both in the same direction or pointing in opposite directions). crossproduct will not be valid in these cases, so you first need to check dot(v1, v2) > 0.999999 and dot(v1, v2) < -0.999999, respectively, and either return an identity...
Cartesian product of x and y array points into single array of 2D points
...of this approach is that it produces consistent output for arrays of the same size. The meshgrid + dstack approach, while faster in some cases, can lead to bugs if you expect the cartesian product to be constructed in the same order for arrays of the same size.
– tlnagy
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Java executors: how to be notified, without blocking, when a task completes?
...I need to submit to an executor service. I want them processed one at a time. The simplest way I can think of is to:
11 A...
Bootstrap 3 and 4 .container-fluid with grid adding unwanted padding
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<div class="container-fluid">
<div class="row">
Some text
</div>
</div>
See http://jsfiddle.net/3px20h6t/
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How should I edit an Entity Framework connection string?
...o edit my app.config file to change the connection string for an Entity Framework data model ( .edmx file). But I'd like to know: Is there a way to edit the EF connection string using the designer?
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How to check if std::map contains a key without doing insert?
...td::pair.second for false , but the problem is that this still inserts something if the key is unused, whereas what I want is a map.contains(key); function.
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Unescape HTML entities in Javascript?
I have some Javascript code that communicates with an XML-RPC backend.
The XML-RPC returns strings of the form:
29 Answers
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Transitions on the CSS display property
I'm currently designing a CSS 'mega dropdown' menu - basically a regular CSS-only dropdown menu, but one that contains different types of content.
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Hyphen, underscore, or camelCase as word delimiter in URIs?
...or an intranet app. I realize it's a pretty small concern in the grand scheme of things, but: should I use hyphens, underscores, or camelCase to delimit words in the URIs?
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Simulate CREATE DATABASE IF NOT EXISTS for PostgreSQL?
...ask the system catalog pg_database - accessible from any database in the same database cluster. The tricky part is that CREATE DATABASE can only be executed as a single statement. The manual:
CREATE DATABASE cannot be executed inside a transaction block.
So it cannot be run directly inside a funct...