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To find whether a column exists in data frame or not
I have a data.frame with the name "abcframe"
4 Answers
4
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Why is the default value of the string type null instead of an empty string?
It's quite annoying to test all my strings for null before I can safely apply methods like ToUpper() , StartWith() etc...
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How do I simulate a hover with a touch in touch enabled browsers?
... Have you tested this with multiple elements and long touch? Meaning the user moves his finger around the screen, and show a hover style for each element?
– Marcus
May 18 '11 at 14:27
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How to have favicon / icon set when bookmarklet dragged to toolbar?
...con you want to use for your bookmarklet.
Open Bookmarks Manager, click Organize dropdown, and select Export, save your bookmarks as html file.
Open that html file in text editor.
Find the bookmark you just created, lets say its Gmail bookmark, you should have an html code for it, that looks like t...
What are the best PHP input sanitizing functions?
...ying to come up with a function that I can pass all my strings through to sanitize. So that the string that comes out of it will be safe for database insertion. But there are so many filtering functions out there I am not sure which ones I should use/need.
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How do I retrieve my MySQL username and password?
I lost my MySQL username and password. How do I retrieve it?
10 Answers
10
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Populating Spring @Value during Unit Test
... Spring integration test approach. Some answers and comments in here are leaning toward a Mockito approach, for which this certainly doesn't work (since there's nothing in Mockito that will populate the @Values, regardless of whether the corresponding property is set or not.
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Creating a daemon in Linux
...t The sigaction() function provides a more comprehensive and reliable mechanism for controlling signals; new applications should use sigaction() rather than signal().
– patryk.beza
Aug 8 '16 at 11:57
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.NET Global exception handler in console application
Question: I want to define a global exception handler for unhandled exceptions in my console application. In asp.net, one can define one in global.asax, and in windows applications /services, one can define as below
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Update data in ListFragment as part of ViewPager
...emember, we're not persisting the exact
// Fragment instance. This mechanism simply gives us a way to persist access to the
// 'current' fragment instance for the given fragment (which changes across orientation
// changes).
//
// The outcome of all this is that the "Refresh" men...