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Assign multiple columns using := in data.table, by group
...t(dim(get(objectName))),by=objectName]. Trouble is that as.list has call overhead and also copies the small vector. If efficiency is a problem as number of groups rises then please let us know.
– Matt Dowle
May 21 '14 at 11:49
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Adding a build configuration in Xcode
...roject as in the screenshot, YES, I selected Info tab THEN my project) but all those options are still greyed out?
– Can Poyrazoğlu
Sep 5 '16 at 7:09
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XML schema or DTD for logback.xml?
...
It is not supported officially according to the documentation, but there is an independent project to provide Schema for Logback
However, due to extreme flexibility of the Logback configuration, Schema cannot support all possible configuration option...
How to solve java.lang.NoClassDefFoundError?
...er (in this case java.net.URLClassLoader), which is responsible for dynamically loading classes, cannot find the .class file for the class that you're trying to use.
Your code wouldn't compile if the required classes weren't present (unless classes are loaded with reflection), so usually this exce...
What's the difference of strings within single or double quotes in groovy?
...ic here:
http://docs.groovy-lang.org/latest/html/documentation/index.html#all-strings
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In Unix, can I run 'make' in a directory without cd'ing to that directory first?
...
makefile:
all:
gcc -Wall -Wpedantic -std=gnu99 -g src/test.c -o build/test
run:
./build/test
or
run:
./../build/test
etc.
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How to apply a patch generated with git format-patch?
...ch
Then a dry run to detect errors:
git apply --check a_file.patch
Finally, you can use git am to apply your patch as a commit: it allows you to sign off an applied patch.
This can be useful for later reference.
git am --signoff < a_file.patch
See an example in this article:
In your...
No provider for “framework:jasmine”! (Resolving: framework:jasmine)
...arma-jasmine" to the devDependencies in packages.json and running "npm install" again.
npm install karma-jasmine --save-dev
This solved the error message "No provider for “framework:jasmine”!"
I also had to add a karma browser launcher to the devDependencies, as I got the message that no laun...
Gulp.js task, return on src?
...nt it doesn't address why there are many examples out there of tasks that call gulp.src(... but don't return it.
– Mark Amery
Apr 17 '15 at 11:13
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How do I get the current line number?
...er to do this work for you, by writing a utility method that uses the new caller attributes:
using System.Runtime.CompilerServices;
static void SomeMethodSomewhere()
{
ShowMessage("Boo");
}
...
static void ShowMessage(string message,
[CallerLineNumber] int lineNumber = 0,
[CallerMemberN...