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data.table vs dplyr: can one do something well the other can't or does poorly?
...j and by together is by design. By keeping related operations together, it allows to easily optimise operations for speed and more importantly memory usage, and also provide some powerful features, all while maintaining the consistency in syntax.
1. Speed
Quite a few benchmarks (though mostly on g...
HTML5 Canvas 100% Width Height of Viewport?
....getContext('2d');
// resize the canvas to fill browser window dynamically
window.addEventListener('resize', resizeCanvas, false);
function resizeCanvas() {
canvas.width = window.innerWidth;
canvas.height = window.innerHeight;
/**
* You...
How Do I 'git fetch' and 'git merge' from a Remote Tracking Branch (like 'git pull')
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so if origin has 1000 branches, you'd a remote branch for all of them?
– Gauthier
Jun 8 '10 at 15:41
4
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Setting the filter to an OpenFileDialog to allow the typical image formats?
I have this code, how can I allow it to accept all typical image formats? PNG, JPEG, JPG, GIF?
11 Answers
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How do I edit /etc/sudoers from a script?
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Old thread, but what about:
echo 'foobar ALL=(ALL:ALL) ALL' | sudo EDITOR='tee -a' visudo
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What is the difference between a 'closure' and a 'lambda'?
... function definition is re-written as binding a lambda to a variable internally. In other languages, like Python, there are some (rather needless) distinctions between them, but they behave the same way otherwise.
A closure is any function which closes over the environment in which it was defined. ...
jQuery selectors on custom data attributes using HTML5
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$("ul[data-group='Companies'] li[data-company='Microsoft']") //Get all elements with data-company="Microsoft" below "Companies"
$("ul[data-group='Companies'] li:not([data-company='Microsoft'])") //get all elements with data-company!="Microsoft" below "Companies"
Look in to jQuery Selector...
How do I redirect in expressjs while passing some context?
...":"your string here"
}
}));
});
So if you want to redirect all req query string variables you can simply do
res.redirect(url.format({
pathname:"/",
query:req.query,
});
});
And if you are using Node >= 7.x you can also use the querystring core module
const...
Limit labels number on Chart.js line chart
I want to display all of the points on my chart from the data I get, but I don't want to display all the labels for them, because then the chart is not very readable. I was looking for it in the docs, but couldn't find any parameter that would limit this.
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How do I query for all dates greater than a certain date in SQL Server?
...o a proper datetime, and using single quotes will fix this issue.)
Technically, the parser might allow you to get away with
select *
from dbo.March2010 A
where A.Date >= '2010-04-01'
it will do the conversion for you, but in my opinion it is less readable than explicitly converting to a Da...