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Subset of rows containing NA (missing) values in a chosen column of a data frame
...r "NA" and "NULL" cells may be of various type (the default behavior is to convert "NA" strings to NA values, and let "NULL" strings as is).
If using read.table() or read.csv(), you should consider the "na.strings" argument to do clean data import, and always work with real R NA values.
An example...
Python, Unicode, and the Windows console
...))
safeprint(u"\N{EM DASH}")
The bad character(s) in the string will be converted in a representation which is printable by the Windows console.
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How to resume Fragment from BackStack if exists
...asier since it shouldn't require keeping track of a number that may change and reinforces the "unique back stack entry" logic.
Since you want only one back stack entry per Fragment, make the back state name the Fragment's class name (via getClass().getName()). Then when replacing a Fragment, use th...
git:// protocol blocked by company, how can I get around that?
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For a little more control of which URL gets converted, you can specify part of URL as well. For example: I have a private internal server 'myserver.lan.example.com' that hosts git repos over SSH (gitlab) but not HTTPS. Therefore, I must use SSH if I want to take adva...
Why use String.Format? [duplicate]
...fic number of + operators all specified in a single expression it will be converted, by the compiler, into a single call to string.Concat, and there will not be any intermediate strings created. Using a StringBuilder would in fact hurt performance, not help it, since Concat can create an internal ...
RESTful on Play! framework
... I am trying out your example, I am curious where the posted JSON data is converted to User class. for example, inside the createUser function I find the newUser is null.
– Gary
Dec 15 '10 at 3:50
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How to run a shell script in OS X by double-clicking?
...t app. But I have some problem here. I have a python script that I want to convert into an .app file. My script includes a line where the user has to type some input (raw_input()), when the .app reaches this line of code, it throws an EOF (end of file) error. What can I do about it?
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Creating a new DOM element from an HTML string using built-in DOM methods or Prototype
...ype, to provide access to the template's contents. This means that you can convert an HTML string to DOM elements by setting the innerHTML of a <template> element, then reaching into the template's .content property.
Examples:
/**
* @param {String} HTML representing a single element
* @ret...
How to get Android crash logs?
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If your app is being downloaded by other people and crashing on remote devices, you may want to look into an Android error reporting library (referenced in this SO post). If it's just on your own local device, you can use LogCat. Even if the device wasn't connected to a ...
System.Timers.Timer vs System.Threading.Timer
I have been checking out some of the possible timers lately, and System.Threading.Timer and System.Timers.Timer are the ones that look needful to me (since they support thread pooling).
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