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Filter rows which contain a certain string
...the mtcars data set. Imagine you are only interested in cars produced by Mazda or Toyota.
mtcars$type <- rownames(mtcars)
dplyr::filter(mtcars, grepl('Toyota|Mazda', type))
mpg cyl disp hp drat wt qsec vs am gear carb type
1 21.0 6 160.0 110 3.90 2.620 16.46 0 1 4 4...
SQL selecting rows by most recent date
...rce
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answered Oct 9 '08 at 21:07
Mitchel SellersMitchel Sellers
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Ruby on Rails: How do I add placeholder text to a f.text_field?
...slocum
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How can I switch my git repository to a particular commit
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What are the correct link options to use std::thread in GCC under linux?
...ngine
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answered Dec 27 '11 at 22:24
hmjdhmjd
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Get position of UIView in respect to its superview's superview
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answered Jul 10 '13 at 13:50
mprivatmprivat
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Passport.js - Error: failed to serialize user into session
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It looks like you didn't implement passport.serializeUser and passport.deserializeUser. Try adding this:
passport.serializeUser(function(user, done) {
done(null, user);
});
passport.deserializeUser(function(user, done) {
done(null, user);
});
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Pandas get topmost n records within each group
...orvak
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Parse string to date with moment.js
... East
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Ruby: Merging variables in to a string
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Chucky
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answered Feb 16 '09 at 21:42
Mike WoodhouseMike Woodhouse
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