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Apply a function to every row of a matrix or a data frame
...function to each row. You pass extra arguments to the function as fourth, fifth, ... arguments to apply().
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EF Migrations: Rollback last applied migration?
...
Another detail: If you have an existing Manual Migration you need to roll back to, but realized your "Down" method doesn't really roll things back properly, you can just edit and save it, then rerun update-database -target... until it rolls ...
Setup RSpec to test a gem (not Rails)
...match current best practices:
Bundler supports gem development perfectly. If you are creating a gem, the only thing you need to have in your Gemfile is the following:
source "https://rubygems.org"
gemspec
This tells Bundler to look inside your gemspec file for the dependencies when you run bundl...
nginx missing sites-available directory
...convention to imitate Debian's apache setup. You could create it yourself if you wanted to emulate the same setup.
Create /etc/nginx/sites-available and /etc/nginx/sites-enabled and then edit the http block inside /etc/nginx/nginx.conf and add this line
include /etc/nginx/sites-enabled/*;
Of co...
How to compile without warnings being treated as errors?
... set, by default warnings aren't treated as errors by any compiler I know. If you can't find it, you can try overriding it with -Wno-error, as nightcracker suggested. That should work unless the -Werror is passed after the flags you set in CFLAGS in the makefile.
– Daniel Fisch...
Android: combining text & image on a Button or ImageButton
...the background of the button.
Any text will appear above the background.
If you are looking for something similar in xml there is:
android:background attribute which works the same way.
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Where Is Machine.Config?
...rop in replacements so don't have their own framework directories. Oh, and if you're unlucky enough to still be using .NET 1.1 then there may be a Framework/v1.1.4322 directory.
– Scott Lerch
May 19 '14 at 21:29
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Prevent Default on Form Submit jQuery
...() {
$('form').on('submit', function(e){
// validation code here
if(!valid) {
e.preventDefault();
}
});
});
Cite: https://api.jquery.com/on/
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What are the special dollar sign shell variables?
...like construct of all positional parameters, {$1, $2, $3 ...}.
"$*" is the IFS expansion of all positional parameters, $1 $2 $3 ....
$# is the number of positional parameters.
$- current options set for the shell.
$$ pid of the current shell (not subshell).
$_ most recent parameter (or the abs path ...
.gitignore is ignored by Git
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Even if you haven't tracked the files so far, Git seems to be able to "know" about them even after you add them to .gitignore.
WARNING: First commit your current changes, or you will lose them.
Then run the following commands fr...