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What's the fastest way to merge/join data.frames in R?
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The match approach works when there is a unique key in the second data frame for each key value...
How to round up to the nearest 10 (or 100 or X)?
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64
If you just want to round up to the nearest power of 10, then just define:
roundUp <- functi...
Disable Rails SQL logging in console
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Ryan BiggRyan Bigg
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How to express a NOT IN query with ActiveRecord/Rails?
...e this since it seems a lot of people come to this, if you are using Rails 4 look at the answers by Trung Lê` and VinniVidiVicci.
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Permission is only granted to system app
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edited Aug 14 '16 at 18:21
Ameer
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an...
Simultaneously merge multiple data.frames in a list
... = 1:3, stringsAsFactors=FALSE)
y <- data.frame(i = c("b","c","d"), k = 4:6, stringsAsFactors=FALSE)
z <- data.frame(i = c("c","d","a"), l = 7:9, stringsAsFactors=FALSE)
Update June 2018: I divided the answer in three sections representing three different ways to perform the merge. You proba...
PowerShell: Setting an environment variable for a single command only
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answered Sep 14 '09 at 14:56
Keith HillKeith Hill
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Laravel 4 Eloquent Query Using WHERE with OR AND OR?
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481
Make use of Parameter Grouping (Laravel 4.2). For your example, it'd be something like this:
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Regular Expression to reformat a US phone number in Javascript
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Assuming you want the format "(123) 456-7890":
function formatPhoneNumber(phoneNumberString) {
var cleaned = ('' + phoneNumberString).replace(/\D/g, '')
var match = cleaned.match(/^(\d{3})(\d{3})(\d{4})$/)
if (match) {
return '(' + match[1] + ') ' + ...