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How to succinctly write a formula with many variables from a data frame?
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There is a special identifier that one can use in a formula to mean all the variables, it is the . identifier.
y <- c(1,4,6)
d <- data.frame(y = y, x1 = c(4,-1,3), x2 = c(3,9,8), x3 = c(4,-4,-2))
mod <- lm(y ~ ., data = d)
You can also d...
CSS: how to add white space before element's content?
...the text-indent property.
p { text-indent: 1em; }
JSFiddle demo
Edit:
If you want the space to be colored, you might consider adding a thick left border to the first letter. (I'd almost-but-not-quite say "instead", because the indent can be an issue if you use both. But it feels dirty to me t...
Is it not possible to stringify an Error using JSON.stringify?
...using web sockets. I can replicate the issue I am facing using JSON.stringify to cater to a wider audience:
10 Answers
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PHP String to Float
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^worth noting that (float) removes 0 from string if it's the first digit
– user3608589
Jan 24 '17 at 12:47
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Mongoose's find method with $or condition does not work properly
...:objId}, {'name':param}, {'nickname':param} ]},
function(err,docs){
if(!err) res.send(docs);
});
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Executing injected by innerHTML after AJAX call
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If you ask me, this is a far better answer than the accepted one. This is pretty much JavaScript injection.
– Xedret
Sep 27 '13 at 19:16
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Using .gitignore to ignore everything but specific directories
...u have to explicitly allow content for each level you want to include. So if I have subdirectories 5 deep under themes, I still need to spell that out.
This is only how it worked for me. If someone cares to offer a more informed explanation by all means.
Also, these answers helpful:
how-do-nega...
How to make PDF file downloadable in HTML link?
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This code is likely dangerous in another way. If you pass HTTP links to fopen, I think it'll go retrieve the file from another server. Could be used by an attacker to attempt to scan your internal network for exposed PDF files.
– Rory McCune
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How to set JFrame to appear centered, regardless of monitor resolution? [closed]
...s a special effect when you pass it a null. According to the Javadoc:
If the component is null, or the GraphicsConfiguration associated with this component is null, the window is placed in the center of the screen.
This should be done after setting the size or calling pack(), but before setti...
Select all 'tr' except the first one
... crossbrowser way of selecting the rows you want with CSS alone.
However, if you don't care about Internet Explorer 6, 7 or 8:
tr:not(:first-child) {
color: red;
}
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