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Assign multiple columns using := in data.table, by group
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f <- function(x) {list("hi", "hello")}
x[ , c("col1", "col2") := f(), by = a][]
# a b col1 col2
# 1: 1 1 hi hello
# 2: 2 2 hi hello
# 3: 3 3 hi hello
# 4: 1 4 hi hello
# 5: 2 5 hi hello
# 6: 3 6 hi hello
x[ , c("mean", "sum") := list(mean(b), sum(b)), by = a][]
# a b col1 c...
Javascript - How to extract filename from a file input control
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Assuming your <input type="file" > has an id of upload this should hopefully do the trick:
var fullPath = document.getElementById('upload').value;
if (fullPath) {
var startIndex = (fullPath.indexOf('\\') >= 0 ? fullPath.lastIndexOf('\\') : fullPath.lastIndexO...
Searching for UUIDs in text with regex
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I agree that by definition your regex does not miss any UUID. However it may be useful to note that if you are searching especially for Microsoft's Globally Unique Identifiers (GUIDs), there are five equivalent string representations for ...
ssh: The authenticity of host 'hostname' can't be established
...risks to doing this. If the resource you're connecting to has been spoofed by an attacker, they could potentially replay the destination server's challenge back to you, fooling you into thinking that you're connecting to the remote resource while in fact they are connecting to that resource with you...
Clear back stack using fragments
...ations. For example, you will hit lifecycle events that you don't need to by popping every fragment off of the stack sequentially.
– Brian Griffey
Jan 16 '12 at 16:24
238
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How do you clear the focus in javascript?
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This is an old answer so you may know by now, but there are two reasons this answer does not apply. 1. It assumes the OP was using jquery, 2. this needs to be the focused element, while the question explicitly states the OP does not know the focused element ahead...
Get Selected index of UITableView
...for quicker use. The above method offers more control and can be modified by your (example) detail view controller.
– Kolin Krewinkel
Oct 27 '10 at 23:04
add a comment
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How to combine two jQuery results
... imageUploader: {
brandingHtml: "Powered by \u003ca href=\"https://imgur.com/\"\u003e\u003csvg class=\"svg-icon\" width=\"50\" height=\"18\" viewBox=\"0 0 50 18\" fill=\"none\" xmlns=\"http://www.w3.org/2000/svg\"\u003e\u003cpath d=\"M46.1709 9.17788C46.1709 8.26454...
MySQL: ignore errors when importing?
... imageUploader: {
brandingHtml: "Powered by \u003ca href=\"https://imgur.com/\"\u003e\u003csvg class=\"svg-icon\" width=\"50\" height=\"18\" viewBox=\"0 0 50 18\" fill=\"none\" xmlns=\"http://www.w3.org/2000/svg\"\u003e\u003cpath d=\"M46.1709 9.17788C46.1709 8.26454...
Trying to load jquery into tampermonkey script
... imageUploader: {
brandingHtml: "Powered by \u003ca href=\"https://imgur.com/\"\u003e\u003csvg class=\"svg-icon\" width=\"50\" height=\"18\" viewBox=\"0 0 50 18\" fill=\"none\" xmlns=\"http://www.w3.org/2000/svg\"\u003e\u003cpath d=\"M46.1709 9.17788C46.1709 8.26454...