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How to construct a relative path in Java from two absolute paths (or URLs)?

... little roundabout, but why not use URI? It has a relativize method which does all the necessary checks for you. String path = "/var/data/stuff/xyz.dat"; String base = "/var/data"; String relative = new File(base).toURI().relativize(new File(path).toURI()).getPath(); // relative == "stuff/xyz.dat"...
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commandButton/commandLink/ajax action/listener method not invoked or input value not set/updated

...m input values and invoke a method in JSF bean and <h:commandButton> does not initiate a postback. You cannot nest multiple UIForm components in each other. This is illegal in HTML. The browser behavior is unspecified. Watch out with include files! You can use UIForm components in parallel, b...
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What is the difference between Polymer elements and AngularJS directives?

...pt on the web and something other frameworks will leverage. What problems does Polymer solve that AngularJS has not or will not? Similarities: declarative templates, data binding. Differences: Angular has high level APIs for services, filters, animations, etc., supports IE8, and at this point, i...
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Constructing pandas DataFrame from values in variables gives “ValueError: If using all scalar values

...s shown here would also be ok to build from a dictionary because the order does not matter (but this hasn't been implemented). However with multiple rows, Pandas would not be able to make a DataFrame because it would not know which items belonged to the same row. – Alexander ...
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Create a pointer to two-dimensional array

... that this only works in C, because T[] and T[N] are compatible types. C++ does not have a concept of compatible types, and so it will reject that code, because T[] and T[10] are different types. The following alternative doesn't work at all, because the element type of the array, when you view ...
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ORA-00054: resource busy and acquire with NOWAIT specified or timeout expired

...lect * from V$LOCKED_OBJECT, for example, returns ORA-00942: table or view does not exist). Any ideas? – random_forest_fanatic Jul 18 '13 at 13:09 3 ...
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Label encoding across multiple columns in scikit-learn

... not having all the categories for all variables. eg., say the color green does not show up in my new data set. this will mess up the encoding. – Ben Dec 2 '15 at 20:41 3 ...
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How does deriving work in Haskell?

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UnicodeDecodeError when redirecting to file

...rean) character (because it is represented with 3 code points—even if it does not have to, as print("\uac01") shows). However, in many practical circumstances, the length of a string is its number of user-perceived characters, because many characters are typically stored by Python as a single Unic...
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Is VB really case insensitive?

...e. Edit your code in Notepad so it has ss and SS and see what the compiler does. EDIT Quote from Jeffrey Richter in the .NET Framework Design Guidelines page 45. To be clear, the CLR is actually case-sensitive. Some programming languages, like Visual Basic, are case insensitive. When the ...