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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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How do you specify the date format used when JAXB marshals xsd:dateTime?
When JAXB marshals a date object ( XMLGregorianCalendar ) into an xsd:dateTime element. How can you specify the format of the resulting XML?
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Set multiple properties in a List ForEach()?
...eed to do is introduce some brackets so that your anonymous method can support multiple lines:
list.ForEach(i => { i.a = "hello!"; i.b = 99; });
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Using “super” in C++
...rne Stroustrup mentions in Design and Evolution of C++ that super as a keyword was considered by the ISO C++ Standards committee the first time C++ was standardized.
Dag Bruck proposed this extension, calling the base class "inherited." The proposal mentioned the multiple inheritance issue, and wo...
Knockout.js bound input value not updated when I use jquery .val('xyz')
... not trigger the change event. So, you can just do .val("blah").change() for KO to pick up the changes.
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Creating an instance of class
...1 */ Foo* foo1 = new Foo ();
Creates an object of type Foo in dynamic memory. foo1 points to it. Normally, you wouldn't use raw pointers in C++, but rather a smart pointer. If Foo was a POD-type, this would perform value-initialization (it doesn't apply here).
/* 2 */ Foo* foo2 = new Foo;
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POST data to a URL in PHP
How can I send POST data to a URL in PHP (without a form)?
3 Answers
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How to download and save a file from Internet using Java?
There is an online file (such as http://www.example.com/information.asp ) I need to grab and save to a directory. I know there are several methods for grabbing and reading online files (URLs) line-by-line, but is there a way to just download and save the file using Java?
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How to delete and replace last line in the terminal using bash?
I want to implement a progress bar showing elapsed seconds in bash. For this, I need to erase the last line shown on the screen (command "clear" erases all the screen, but I need to erase only the line of the progress bar and replace it with the new information).
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Can I make the foreign key field optional in Django model
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Sure, just add blank=True, null=True for each field that you want to remain optional like
subject = models.ForeignKey(subjects, blank=True, null=True)
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