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Using R to list all files with a specified extension

...f.files <- files[-grep(".xml", files, fixed=T)] First line just lists all files from working dir. Second one drops everything containing ".xml" (grep returns indices of such strings in 'files' vector; subsetting with negative indices removes corresponding entries from vector). "fixed" argument ...
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Gradle build without tests

... Try: gradle assemble To list all available tasks for your project, try: gradle tasks UPDATE: This may not seem the most correct answer at first, but read carefully gradle tasks output or docs. Build tasks ----------- assemble - Assembles the outputs...
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Get selected element's outer HTML

... I believe that currently (5/1/2012), all major browsers support the outerHTML function. It seems to me that this snippet is sufficient. I personally would choose to memorize this: // Gives you the DOM element without the outside wrapper you want $('.classSele...
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Best practice to make a multi language application in C#/WinForms? [closed]

...ications suitable for multiple languages in C# since I need to work on a small project where this is the case. I have found basically two ways to do this: ...
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Why does NULL = NULL evaluate to false in SQL server

... I disagree that null signifies "unknown". What it actually means is "no data". That might be used to represent the case where information is not known, but it is actually more likely to be used to indicate that something doesn't exist. To continue your example: What is Frank's m...
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How to modify a text file?

... This is an operating system thing, not a Python thing. It is the same in all languages. What I usually do is read from the file, make the modifications and write it out to a new file called myfile.txt.tmp or something like that. This is better than reading the whole file into memory because the f...
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What is the naming convention in Python for variable and function names?

... C# background the naming convention for variables and method names are usually either camelCase or PascalCase: 13 Answers ...
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How can I use a carriage return in a HTML tooltip?

...>link with tip</a> Firefox won't display multi-line tooltips at all though - it will replace the newlines with nothing. share | improve this answer | follow ...
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How to change a nullable column to not nullable in a Rails migration?

...s: # Make sure no null value exist MyModel.where(date_column: nil).update_all(date_column: Time.now) # Change the column to not allow null change_column :my_models, :date_column, :datetime, null: false share | ...
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How to grep Git commit diffs or contents for a certain word?

In a Git code repository I want to list all commits that contain a certain word. I tried this 8 Answers ...