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Convert data.frame columns from factors to characters
...b[i] <- lapply(bob[i], as.character)
In package dplyr in version 0.5.0 new function mutate_if was introduced:
library(dplyr)
bob %>% mutate_if(is.factor, as.character) -> bob
...and in version 1.0.0 was replaced by across:
library(dplyr)
bob %>% mutate(across(where(is.factor), as.chara...
Right query to get the current number of connections in a PostgreSQL DB
...l = function(e) {
var $elem = $('.new-login-left'),
docViewTop = $window.scrollTop(),
docViewBottom = docViewTop + $window.height(),
...
bash/fish command to print absolute path to a file
... This tool was introduced in GNU coreutils 8.15 (in 2012), so it's quite new.
– marbu
Feb 6 '14 at 22:29
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How to count total lines changed by a specific author in a Git repository?
...ally its the exact same but tformat puts a terminator character (usually a newline) at the end of each line
– aug
May 29 '14 at 6:34
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How to create a library project in Android Studio and an application project that uses the library p
I'm new to the gradle build system and IntelliJ.
14 Answers
14
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How to reference a file for variables using Bash?
... Is there a way to use source by piping in the content rather than providing a file? Like some command | source does not work...
– Elliot Chance
Jul 28 '15 at 23:51
1
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Javascript Cookie with no expiration date
... for vanilla JS: document.cookie = 'subscripted_24=true; expires=' + new Date(2147483647 * 1000).toUTCString();
– Oksana Romaniv
Oct 3 '19 at 17:31
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Are table names in MySQL case sensitive?
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This only affects new tables. Existing tables have to be renamed to lowercase before changing this setting.
– Martin
Apr 12 '17 at 10:08
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Using NSPredicate to filter an NSArray based on NSDictionary keys
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to clarify for new coders like me, the key line of code is 'NSArray *filtered = [data filteredArrayUsingPredicate:[NSPredicate predicateWithFormat:@"(BAR == %@)", @"foo"]];' where 'data' is the nsarray of nsdictionaries that is already in y...
Why no ICloneable?
... wanting to clone a List<T>, such that the cloned List<T> is a new collection holding pointers to all of the same objects in the original collection, there are two easy ways of doing that without ICloneable<T>. The first is the Enumerable.ToList() extension method: List<foo> ...