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How do I calculate the normal vector of a line segment?
Suppose I have a line segment going from (x1,y1) to (x2,y2). How do I calculate the normal vector perpendicular to the line?
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sqlalchemy flush() and get inserted id?
...lated immediately within the flush() process as they are generated, and no call to commit() should be required. So the answer here lies in one or more of the following:
The details of your mapping
If there are any odd quirks of the backend in use (such as, SQLite doesn't generate integer values f...
How to set username and password for SmtpClient object in .NET?
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The SmtpClient can be used by code:
SmtpClient mailer = new SmtpClient();
mailer.Host = "mail.youroutgoingsmtpserver.com";
mailer.Credentials = new System.Net.NetworkCredential("yourusername", "yourpassword");
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In JavaScript, is returning out of a switch statement considered a better practice than using break?
...opt in o) ? o[opt] : "";, but it always returns the default in my specific case.
– Code Maverick
May 24 '11 at 18:51
T...
How to see which plugins are making Vim slow?
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You can use built-in profiling support: after launching vim do
:profile start profile.log
:profile func *
:profile file *
" At this point do slow actions
:profile pause
:noautocmd qall!
(unlike quitting noautocmd is not really...
Set folder browser dialog start location
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Just set the SelectedPath property before calling ShowDialog.
fdbLocation.SelectedPath = myFolder;
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What does it mean when git says a file “needs update”?
I can't for the life of me find any decent explanation of the "[file]: needs update" message that git sometimes spits out from time to time. Even the official git FAQ has explaining this marked as a TODO. If someone could explain A) what it means; and B) how to fix it, I would be extremely gratefu...
Finding the path of the program that will execute from the command line in Windows
...ystem path. Now suppose there is another program on the system that's also called X.EXE but is installed in folder c:\windows\ .
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How can I initialize an ArrayList with all zeroes in Java?
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The integer passed to the constructor represents its initial capacity, i.e., the number of elements it can hold before it needs to resize its internal array (and has nothing to do with the initial number of elements in the list).
To initialize an list with 60 zeros you do:
List<In...
Programmatically fire button click event?
Is there a way to programmatically fire a button click event? I have a button placed there in an UIView, and in a particular scenario i want to click the button via code, not manually as a user. Is it possible in iOS development? Please provide your suggestions and guide me how to do that.
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