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How to get a vertical geom_vline to an x-axis of class date?

Even though I found Hadley's post in the google group on POSIXct and geom_vline , I could not get it done. I have a time series from and would like to draw a vertical line for years 1998, 2005 and 2010 for example. I tried with ggplot and qplot syntax, but still I either see no vertical line ...
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Python constructors and __init__

Why are constructors indeed called "Constructors"? What is their purpose and how are they different from methods in a class? ...
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How can I generate a diff for a single file between two branches in github

... me to do this for all changed files, but that's no good as there are thousands of files in my repo. 5 Answers ...
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What is the difference between Caching and Memoization?

I would like to know what the actual difference between caching and memoization is. As I see it, both involve avoiding repeated function calls to get data by storing it . ...
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Checking if a folder exists (and creating folders) in Qt, C++

... Why it isn't static? QDir::exists("absolutepath") and QDir::mkdir(""absolutepath") – yalov Jun 19 '17 at 17:20 ...
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Pass variables to Ruby script via command line

I've installed RubyInstaller on Windows and I'm running IMAP Sync but I need to use it to sync hundreds of accounts. If I could pass these variables to it via command line I could automate the whole process better. ...
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How to return dictionary keys as a list in Python?

...keys()). This will convert the dict_keys object to a list. On the other hand, you should ask yourself whether or not it matters. The Pythonic way to code is to assume duck typing (if it looks like a duck and it quacks like a duck, it's a duck). The dict_keys object will act like a list for most pu...
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SQL Server - When to use Clustered vs non-Clustered Index?

I know primary differences between clustered and non clustered indexes and have an understanding of how they actually work. I understand how clustered and non-clustered indexes improve read performance. But one thing I am not sure is that what would be the reasons where I would choose one over the o...
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Pandoc markdown page break

Recently I started using Pandoc markdown which seems a good alternative to LaTeX, as my document does not have many mathematical formulas, and I do not have ANY experience with LaTeX, which combined with less than 2 week submission deadline makes it a good solution. ...
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How can I format patch with what I stash away

...changes. Is it possible that I can create a patch with what I stash away? And then apply that patch in some other repository (my co-worker's)? ...