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Assign multiple columns using := in data.table, by group

What is the best way to assign to multiple columns using data.table ? For example: 2 Answers ...
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How to Get a Layout Inflater Given a Context?

I am writing a custom implementation of a ListAdapter. 2 Answers 2 ...
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How to center a label text in WPF?

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SQL query for today's date minus two months

I want to select all the records in a table where their date of entry is older then 2 months. 5 Answers ...
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How to specify data attributes in razor, e.g., data-externalid=“23151” on @this.Html.CheckBoxFor(…)

With razor, I'm unable to specify values for data- attributes such as data-externalid="23521" 1 Answer ...
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Using pickle.dump - TypeError: must be str, not bytes

I'm using python3.3 and I'm having a cryptic error when trying to pickle a simple dictionary. 2 Answers ...
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“icon-bar” in twitter bootstrap navigation bar

I cannot understand what the following code means in terms of icon-bar : 3 Answers 3 ...
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What is the lifecycle of an AngularJS Controller?

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How to check a string for specific characters?

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error: default argument given for parameter 1

I'm getting this error message with the code below: 1 Answer 1 ...