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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 can I select random files from a directory in bash?
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12 Answers
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Ruby Regexp group matching, assign variables on 1 line
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201
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...
Maven Run Project
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mvn exec:java -Dexec.mainClass="com.example.Main" [-Dexec.args="argument1"] ...
The invocation can be as simple as mvn exec:java if the plugin configuration is in your pom.xml. The plugin site on Mojohaus has a more detailed example.
<project>
<build>
<plugins>
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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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13 Answers
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How to get HTML 5 input type=“date” working in Firefox and/or IE 10
...ew types on an input element. Not surprised that it is not supported in IE10. So, my question is...
14 Answers
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How do I concatenate two arrays in C#?
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edited Oct 27 '14 at 11:46
RaphaelH
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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...