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Assign multiple columns using := in data.table, by group
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This now works in v1.8.3 on R-Forge. Thanks for highlighting it!
x <- data.table(a = 1:3, b = 1:6)
f <- function(x) {list("hi", "hello")}
x[ , c("col1", "col2") := f(), by = a][]
# a b col1 col2
# 1: 1 1 hi hello
# ...
Convert List to List
... covariant conversions on interfaces and delegates when the conversion is known to be always safe. See my blog articles on covariance and contravariance for details. (There will be a fresh one on this topic on both Monday and Thursday of this week.)
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Allow CORS REST request to a Express/Node.js application on Heroku
...at works for requests from the js console in Chrome, and URL bar, etc. I'm now trying to get it working for requests from another app, on a different domain (CORS).
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Function passed as template argument
...cout << "Result is " << temp << std::endl;
}
which can now be called as either:
doOperation(add2);
doOperation(add3());
See it live
The problem with this is that if it makes it tricky for the compiler to inline the call to add2, since all the compiler knows is that a function...
CSS for grabbing cursors (drag & drop)
... I saw the move icon, thought the grab icon was better. But now that you pointed out w3c considers that cursor "Indicates something is to be moved," it makes the most sense. Thanks.
– at.
Apr 18 '11 at 7:05
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Detect Chrome extension first run / update
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Updated answer to reflect v3 of manifest:
Chromium now has a chrome.runtime set of APIs, which allow you to fetch the version of the extension.
To get the current version:
chrome.runtime.getManifest().version
To listen when the extension has been first installed, when th...
const char * const versus const char *?
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(I know this is old but I wanted to share anyway.)
Just wanted to elaborate on Thomas Matthews' answer. The Right-Left Rule of C type declarations pretty much says: when reading a C type declaration start at the identifier and g...
Remove/Add Line Breaks after Specific String using Sublime Text
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Seems so obvious now... thanks a million! Also, @Mauro - I'm on Windows, and I can used ctrl + d to select the next iteration of the selection. Perhaps the same functionality exists on MAC with Command + d ? You may have to press it numerous ...
“aapt” IOException error=2, No such file or directory" why can't I build my gradle on jenkins?
...his helped get me by the same error I was having with aapt. Note ldd aapt now works, and shows dependencies. Previously it stated that the program wasn't a dynamic executable "not a dynamic executable". Now on to the next problem!
– guyland123
Aug 19 '14 at 1...
brew update: The following untracked working tree files would be overwritten by merge:
...ntually run brew doctor again to ensure yourself that the warning is gone.
Now, you should have a
Warning: You have uncommitted modifications to Homebrew
that may bey solved by
cd /usr/local/Library && git stash && git clean -d -f
as suggested by Dr.Brew itself. The command sta...