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How to calculate the angle between a line and the horizontal axis?
...aX*deltaX+deltaY*deltaY)), unless the length is 0.
After that, deltaX will now be the cosine of the angle between the vector and the horizontal axis (in the direction from the positive X to the positive Y axis at P1).
And deltaY will now be the sine of that angle.
If the vector's length is 0, it won...
Generate Java classes from .XSD files…?
...r.marshal(item, sw);
XML to POJO
Let's reverse the process. Assume that I now have a piece of XML string data and I want to turn it into Item.java object. XML data (Code listing 3) looks like
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<ns1:item ns1:id="2" xmlns:ns1="http://blo...
Best design for a changelog / auditing database table? [closed]
...D
That's when design of our audit log really stabilized (for a few years now).
Of course, the last "improvement" would work only for tables that had surrogate keys. But guess what? All our tables that are worth auditing do have such a key!
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How to print colored text in Python?
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Just noticed that as of 13/01/2011, it's now under MIT license
– Alexander Tsepkov
Oct 28 '11 at 2:19
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How to change MySQL data directory?
...r reload
Restart MySQL with the command:
sudo /etc/init.d/mysql restart
Now login to MySQL and you can access the same databases you had before.
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How to format a JavaScript date
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Use the date.format library:
var dateFormat = require('dateformat');
var now = new Date();
dateFormat(now, "dddd, mmmm dS, yyyy, h:MM:ss TT");
returns:
Saturday, June 9th, 2007, 5:46:21 PM
dateformat on npm
http://jsfiddle.net/phZr7/1/
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UITextField - capture return button event
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@Praxiteles This can now be done in storyboard without requiring delegation please check answer below.
– Blake Lockley
Feb 27 '18 at 23:20
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Factory pattern in C#: How to ensure an object instance can only be created by a factory class?
...ctor (since it's part of the class anyway). it's even WORSE, since you can now get a null return value, opening up for NREs and "what the hell does this null mean?" questions.
– sara
Dec 28 '15 at 9:44
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How to create enum like type in TypeScript?
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This should now be the accepted answer since it is still working in the RC and is therefore unlikely to break with future versions of TS.
– Adrian Grigore
Mar 6 '14 at 17:18
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Understanding FFT output
... as sqrt (real * real + imag * imag). This number will always be positive. Now all you have to search is for the maximum value (ignore the first entry in your array. That is your DC offset and carries no frequency dependent information).
You get 32 real and 32 imaginary outputs because you are usin...