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Finding quaternion representing the rotation from one vector to another
I have two vectors u and v. Is there a way of finding a quaternion representing the rotation from u to v?
7 Answers
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Set markers for individual points on a line in Matplotlib
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Specify the keyword args linestyle and/or marker in your call to plot.
For example, using a dashed line and blue circle markers:
plt.plot(range(10), linestyle='--', marker='o', color='b')
A shortcut call for the same thing:
plt.plot(range(10), '--bo')
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Best practices to test protected methods with PHPUnit
...If you're using PHP5 (>= 5.3.2) with PHPUnit, you can test your private and protected methods by using reflection to set them to be public prior to running your tests:
protected static function getMethod($name) {
$class = new ReflectionClass('MyClass');
$method = $class->getMethod($name);...
How to RSYNC a single file?
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-a includes recursive and that is not needed for a single file not sure if I would use that flag for single file as it can lead to unintended behavior if the filename by accident becomes a directory.
– redanimalwar
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JSON.stringify without quotes on properties?
...n to remove quotes by formally parsing the JSON string via native function and reserialize it:
function stringify(obj_from_json) {
if (typeof obj_from_json !== "object" || Array.isArray(obj_from_json)){
// not an object, stringify using native function
return JSON.stringify(obj_...
What is the zero for string?
...to store a value, either through a
declaration or a call of make or new, and no explicit initialization
is provided, the memory is given a default initialization. Each
element of such a value is set to the zero value for its type: false
for booleans, 0 for integers, 0.0 for floats, "" for st...
Cocoa: What's the difference between the frame and the bounds?
UIView and its subclasses all have the properties frame and bounds . What's the difference?
12 Answers
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How to add a WiX custom action that happens only on uninstall (via MSI)?
...ed it out.
There are some solutions online, but none of them really works. And of course there is no documentation.
So in the chart below there are several properties that are suggested to use and the values they have for various installation scenarios:
So in my case I wanted a CA that will run o...
How to find difference between two Joda-Time DateTimes in minutes
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No I disagree, it's too wordy and unclear: "The minutes minutes between punch time date time" is worse than "second date milliseconds minus first date milliseconds"
– Jonathan Neufeld
Feb 19 '15 at 23:11
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Should a retrieval method return 'null' or throw an exception when it can't produce the return value
...uld mean that there was a problem.
If the value can be missing or present and both are valid for the application logic then return a null.
More important: What do you do other places in the code? Consistency is important.
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