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How to count TRUE values in a logical vector
In R, what is the most efficient/idiomatic way to count the number of TRUE values in a logical vector? I can think of two ways:
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How can I test that a value is “greater than or equal to” in Jasmine?
I want to confirm that a value is a decimal (or 0), so the number should be greater than or equal to zero and less than 1.
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Can I have multiple primary keys in a single table?
Can I have multiple primary keys in a single table?
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How to read data From *.CSV file using javascript?
My csv data looks like this:
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How do I access the request object or any other variable in a form's clean() method?
I am trying to request.user for a form's clean method, but how can I access the request object? Can I modify the clean method to allow variables input?
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private[this] vs private
In Scala I see such feature as object-private variable. From my not very rich Java background I learnt to close everything (make it private) and open (provide accessors) if necessary. Scala introduces even more strict access modifier. Should I always use it by default? Or should I use it only in som...
Is it possible to ping a server from Javascript?
I'm making a web app that requires that I check to see if remote servers are online or not. When I run it from the command line, my page load goes up to a full 60s (for 8 entries, it will scale linearly with more).
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Is it a bad practice to use negative margins in Android?
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How to save password when using Subversion from the console
I was wondering if there is a way to save my Subversion password when doing svn operations from the console. The console is the only option that I have. When I try to do any Subversion action, e.g. svn commit , it prompts for the account password every time. Is there a way to save this password s...
How to clear a chart from a canvas so that hover events cannot be triggered?
I'm using Chartjs to display a Line Chart and this works fine:
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