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Looping in a spiral
A friend was in need of an algorithm that would let him loop through the elements of an NxM matrix (N and M are odd). I came up with a solution, but I wanted to see if my fellow SO'ers could come up with a better solution.
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Cross-reference (named anchor) in markdown
Is there markdown syntax for the equivalent of:
10 Answers
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How to select the rows with maximum values in each group with dplyr? [duplicate]
I would like to select a row with maximum value in each group with dplyr.
6 Answers
6
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YouTube iframe API: how do I control an iframe player that's already in the HTML?
I want to be able to control iframe based YouTube players. This players will be already in the HTML, but I want to control them via the JavaScript API.
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Selecting only numeric columns from a data frame
Suppose, you have a data.frame like this:
11 Answers
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How can I check if a Perl array contains a particular value?
I am trying to figure out a way of checking for the existence of a value in an array without iterating through the array.
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How to make a JSONP request from Javascript without JQuery?
Can I make a cross-domain JSONP request in JavaScript without using jQuery or other external library? I would like to use JavaScript itself and then parse the data and make it an object so I could use it. Do I have to use an external library? If not, how can I do it?
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How do I list all files of a directory?
How can I list all files of a directory in Python and add them to a list ?
21 Answers
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How to read multiple text files into a single RDD?
I want to read a bunch of text files from a hdfs location and perform mapping on it in an iteration using spark.
10 Answers...
How to create a multi-tenant database with shared table structures?
Our software currently runs on MySQL. The data of all tenants is stored in the same schema. Since we are using Ruby on Rails we can easily determine which data belongs to which tenant. However there are some companies of course who fear that their data might be compromised, so we are evaluating othe...