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Filter rows which contain a certain string
... @MySchizoBuddy: If the column name contains white space, you can select the variable using backticks. Modifying the example above: mtcars$`my type` <- rownames(mtcars) and then mtcars %>% filter(grepl('Toyota|Mazda', `my type`))
– alex23lemm
Ju...
Example of multipart/form-data
... > a.html
Run:
nc -l localhost 8000
Open the HTML on your browser, select the files and click on submit and check the terminal.
nc prints the request received. Firefox sent:
POST / HTTP/1.1
Host: localhost:8000
User-Agent: Mozilla/5.0 (X11; Ubuntu; Linux i686; rv:29.0) Gecko/20100101 Fire...
How to profile a bash shell script slow startup?
...e set -x later and set +x earlier (or bracket several sections of interest selectively).
Although it's not as fine-grained as GNU date's nanoseconds, Bash 5 includes a variable which gives the time in microseconds. Using it saves you from spawning an external executable for every line and works on ...
How can I add a third button to an Android Alert Dialog?
...'which' argument contains the index position
// of the selected item
switch (which) {
case 0:
Toast.makeText(context, "clicked 1", 0).show();
break;
case 1:...
Fastest exit strategy for a Panic Button in Crisis/Abuse Websites? [closed]
...on:
it is hard to click on it (you have to be accurate)
it takes time to select it (and a huge amount of time if you are on laptop without a mouse)
it saves you in history
it is accessible via back button / backspace.
And how about the panicking random moves of a woman who is trying to quickly c...
Match multiple cases classes in scala
...either sb or sc get bound, but you don't know which, so you'd need further selection logic to decide which to use (given that they were bound to a Option[String], not a String). So there's nothing gained over this:
l match {
case A() => "A"
case B(sb) => "B(" + sb + ")"
case C(s...
Why does an NSInteger variable have to be cast to long when used as a format argument?
...
I suppose the selected answer is technically the best answer to the question, but if you want to know how to avoid casting each occurrence and prevent warnings then I find this is the best solution.
– Daniel Wood
...
PDO Prepared Inserts multiple rows in single query
... INSERT statements instead of building out as a single string query as the selected answer did. I decided to run a simple test with just two fields and a very basic insert statement:
<?php
require('conn.php');
$fname = 'J';
$lname = 'M';
$time_start = microtime(true);
$stmt = $db->prepare('...
Regex Pattern to Match, Excluding when… / Except between
...tring[] ExceptionStrings {
set { m_exceptionRegexes = from es in value select new Regex(es); }
}
public bool IsMatch(string testStr) {
return (
m_searchRegex.IsMatch(testStr)
&& !m_exceptionRegexes.Any(er => er.IsMatch(testStr))
);
}
}
public class App {
...
A simple explanation of Naive Bayes Classification
...d be Democrats or Republicans. They are also either male or female.
If we select one senator completely randomly, what is the probability that this person is a female Democrat? Conditional Probability can help us answer that.
Probability of (Democrat and Female Senator)= Prob(Senator is Democrat) ...