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Drop unused factor levels in a subsetted data frame
...just drop.levels yields "gdata: read.xls support for 'XLS' (Excel 97-2004) files ENABLED." "gdata: Unable to load perl libaries needed by read.xls()" "gdata: to support 'XLSX' (Excel 2007+) files." "gdata: Run the function 'installXLSXsupport()'" "gdata: to automatically download and install the per...
What is the purpose of “&&” in a shell command?
...
See the example:
mkdir test && echo "Something" > test/file
Shell will try to create directory test and then, only if it was successfull will try create file inside it.
So you may interrupt a sequence of steps if one of them failed.
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C++ compile error: has initializer but incomplete type
...was found but not the method leaving the programmer in the dark about what file to include unless he knows the standard library file names by heart, which is a ridiculous expectation. I hope someone reports it as a bug.
– j riv
Jul 9 '18 at 11:07
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Detecting request type in PHP (GET, POST, PUT or DELETE)
...le, without quoting what interpreting engine you're using, add a .htaccess file containing RewriteEngine on RewriteRule ^api/(.*)$ api.php/$1 This assumes your API file is called api.php. Also, since the above code block was written, the PHP developers have depreciated the split function. it work...
How to search a Git repository by commit message?
... rev-list --all)
to show all instances of the given text, the containing file name, and the commit sha1.
Finally, as a last resort in case your commit is dangling and not connected to history at all, you can search the reflog itself with the -g flag (short for --walk-reflogs:
git log -g --grep='...
Android and in TextView
...orks, because the XML parser reads these and substitutes while loading the file, so the entity won't be present in the resulting compiled resources.
  in Android Text (CharSequence) Resources
<!-- Defined in <resources> -->
<string name="html_text">Don\'t break <b>...
Camera orientation issue in Android
...nd looking particularly for
ExifInterface exif = new ExifInterface(SourceFileName); //Since API Level 5
String exifOrientation = exif.getAttribute(ExifInterface.TAG_ORIENTATION);
Since the photo is displaying correctly in your app, i'm not sure where the problem is, but this should definitel...
How would you go about parsing Markdown? [closed]
...d together.
Basically, I'd build a mini-DOM-like tree as I read the input file.
To generate an output, I would just traverse the tree and output HTML or anything else (PS, LaTex, RTF,...)
Things that can increase complexity:
The fact that you can mix HTML and markdown, although the rule could be...
Installing Ruby Gem in Windows
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I downloaded this and now I am stuck with a file that crashes my pc when i try to run, move or delete it, even after rebooting. Never had this before.
– Daan Luttik
May 30 '15 at 12:45
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Evaluating a mathematical expression in a string
...__ = '$Date: 2009-03-20 $'
__source__ = '''http://pyparsing.wikispaces.com/file/view/fourFn.py
http://pyparsing.wikispaces.com/message/view/home/15549426
'''
__note__ = '''
All I've done is rewrap Paul McGuire's fourFn.py as a class, so I can use it
more easily in other places.
'''
class NumericSt...