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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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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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setup cron tab to specific time of during weekdays
...script at certain times of the day and on some specific days of the week. For example, we want to setup a cron job that runs the script with the following sequence:
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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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ggplot: How to increase spacing between faceted plots?
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This works without the grid package. In my experience the x labels of two side-by-side plots often overlap (the greatest label on the lhs and the smallest label on the rhs). One solution to fix the output is to ggsave with a greate...
How to spread django unit tests over multiple files?
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The behavior has changed in Django 1.6, so there is no longer a need to create a package. Just name your files test*.py.
From Django 1.7 documentation
When you run your tests, the default behavior of the test utility is
to find ...
Assign variables to child template in {% include %} tag Django
...uggested, it's pretty simple:
{% include "subject_file_upload.html" with form=form foo=bar %}
The documentation for include mentions this. It also mentions that you can use only to render the template with the given variables only, without inheriting any other variables.
Thank you @Besnik
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