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What is the correct way to create a single-instance WPF application?

...t does not require a dependency on the Microsoft.VisualBasic assembly. If my project already had a dependency on that assembly, I would probably advocate using the approach shown in another answer. But as it is, I do not use the Microsoft.VisualBasic assembly, and I'd rather not add an unnecessary...
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Error: could not find function … in R

...the "cosvol" function in the "celestial" package from command-line. Unlike my R which is installed from Fedora repository into my Linux system, I have downloaded my "celestial" package in a different directory in my "home". Each time I am requesting the function "cosvol()", it says, "could not find ...
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Frequency table for a single variable

... Maybe .value_counts()? >>> import pandas >>> my_series = pandas.Series([1,2,2,3,3,3, "fred", 1.8, 1.8]) >>> my_series 0 1 1 2 2 2 3 3 4 3 5 3 6 fred 7 1.8 8 1.8 >>> counts = my_series.value_counts() >&g...
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Nginx 403 forbidden for all files

...ith PHP-FPM on a CentOS 5 box, but am struggling to get it to serve any of my files - whether PHP or not. 11 Answers ...
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Find size of an array in Perl

...clearer than say scalar(@array); # Represent @array as a scalar and my $size = @array; say $size; The latter looks quite clear alone like this, but I find that the extra line takes away from clarity when part of other code. It's useful for teaching what @array does in scalar context, and ma...
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Why is jquery's .ajax() method not sending my session cookie?

...cally from AJAX response (citation: http://aleembawany.com/2006/11/14/anatomy-of-a-well-designed-ajax-login-experience/) Why? You cannot get value of the cookie from response to set it manually (http://www.w3.org/TR/XMLHttpRequest/#dom-xmlhttprequest-getresponseheader) I'm confused.. There should...
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Gulps gulp.watch not triggered for new or deleted files?

...r deleted files now. It did not when the question was asked. The rest of my answer still stands: gulp-watch is usually a better solution because it lets you perform specific actions only on the files that have been modified, while gulp.watch only lets you run complete tasks. For a project of a re...
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PDOException SQLSTATE[HY000] [2002] No such file or directory

I believe that I've successfully deployed my (very basic) site to fortrabbit, but as soon as I connect to SSH to run some commands (such as php artisan migrate or php artisan db:seed ) I get an error message: ...
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Git Remote: Error: fatal: protocol error: bad line length character: Unab

I set up a git server and want now to push initially my repo from the client. I used git push origin master and get this error message: ...
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How to stop app that node.js express 'npm start'

...ou build node.js app with express v4.x then start your app by npm start . My question is how to stop the app? Is there npm stop ? ...