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Convert data.frame columns from factors to characters
I have a data frame. Let's call him bob :
18 Answers
18
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How to check if a file contains a specific string using Bash
...xpected results. It's safer to always use fgrep (or grep -F) (unless you really need a regex, in which case egrep (or grep -E) is probably the best choice)
– Walter Tross
Apr 27 '18 at 13:25
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In-place type conversion of a NumPy array
...Py array of int32 , how do I convert it to float32 in place ? So basically, I would like to do
6 Answers
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How do I apply a perspective transform to a UIView?
I'm looking to perform a perspective transform on a UIView (such as seen in coverflow)
3 Answers
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AI2 SideBar Extension
Deutsche Version Motivation With smaller apps, the implemented functions can be triggered by a button. With larger apps, however, the available space quickly decreases and the layout becomes confusing. A side bar can help here. There are a number of implementations, but I haven't found a su...
Regex to replace multiple spaces with a single space
...place \s\s+ with ' ':
string = string.replace(/\s\s+/g, ' ');
If you really want to cover only spaces (and thus not tabs, newlines, etc), do so:
string = string.replace(/ +/g, ' ');
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How can I pass arguments to a batch file?
...
Another useful tip is to use %* to mean "all". For example:
echo off
set arg1=%1
set arg2=%2
shift
shift
fake-command /u %arg1% /p %arg2% %*
When you run:
test-command admin password foo bar
the above batch file will run:
fake-command /u admin /p password adm...
How do I set the size of Emacs' window?
... (progn
;; use 120 char wide window for largeish displays
;; and smaller 80 column windows for smaller displays
;; pick whatever numbers make sense for you
(if (> (x-display-pixel-width) 1280)
(add-to-list 'default-frame-alist (cons 'width 120))
(add-to-list ...
QuotaExceededError: Dom exception 22: An attempt was made to add something to storage that exceeded
...ode browsing. While in private browsing, local storage is not available at all.
One solution is to warn the user that the app needs non-private mode to work.
UPDATE: This has been fixed in Safari 11, so the behaviour is now aligned with other browsers.
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eval command in Bash and its typical uses
...de the parentheses in a subshell (i.e. in a separate process that inherits all settings such as variable values from the current shell), and gathers its output. So echo $($n) runs $n as a shell command, and displays its output. Since $n evaluates to 1, $($n) attempts to run the command 1, which does...