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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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How add context menu item to Windows Explorer for folders [closed]
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In the registration editor (regedit.exe) find:
Context menu for right click on folders in lef...
How to check if a process id (PID) exists
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How do you create nested dict in Python?
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A nested dict is a dictionary within a dictionary. A very simple thing.
>>> d = {}
&g...
Ruby Regexp group matching, assign variables on 1 line
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You don't want scan for this, as it makes little sense. You can use String#match which will retu...
Gradle, “sourceCompatibility” vs “targetCompatibility”?
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targetCompatibility and sourceCompatibility maps to -target release and -source release in javac...
Changing every value in a hash in Ruby
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Why is it impossible to build a compiler that can determine if a C++ function will change the value
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