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Drop data frame columns by name
...eps]
EDIT :
For those still not acquainted with the drop argument of the indexing function, if you want to keep one column as a data frame, you do:
keeps <- "y"
DF[ , keeps, drop = FALSE]
drop=TRUE (or not mentioning it) will drop unnecessary dimensions, and hence return a vector with the va...
Merging dictionaries in C#
...roupBy would be better suited than ToLookup ? I think ILookup just adds an indexer, size property and contains method on top of IGrouping - so it got to be a tiny little bit faster ?
– toong
May 30 '13 at 15:25
...
How do I get the first n characters of a string without checking the size or going out of bounds?
...ava without doing a size check first (inline is acceptable) or risking an IndexOutOfBoundsException ?
9 Answers
...
How do I pass the value (not the reference) of a JS variable to a function? [duplicate]
...l= results.length; i < l; i++) {
marker = results[i];
(function(index){
google.maps.event.addListener(marker, 'click', function() {
change_selection(index);
});
})(i);
}
EDIT, 2013:
These are now commonly referred to as an IIFE
...
How can I remove all text after a character in bash?
...u have a directory "/resources/views/admin/users/relationships/posts.blade.php" and you want to truncate everything after the LAST occurrence of the "/", given that you do NOT know how many "/" characters are in the string. So here I would want the output to be "/resources/views/admin/users/relation...
NodeJS: How to get the server's port?
...views/partials
create : test4/views/layout.jade
create : test4/views/index.jade
create : test4/test
create : test4/test/app.test.js
alfred@alfred-laptop:~/node$ cat test4/app.js
/**
* Module dependencies.
*/
var express = require('express');
var app = module.exports = express.creat...
Can I have an IF block in DOS batch file?
...is always true, because IF ERRORLEVEL <N> is true, if errorlevel is equal or greater <N>, the "==" are ignored in this case
– jeb
Feb 13 '11 at 15:50
...
How do you detect the clearing of a “search” HTML5 input?
...r way, hopefully this helps.
References:
http://help.dottoro.com/ljdvxmhr.php
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How to generate a simple popup using jQuery
...ver you like:
a.selected {
background-color:#1F75CC;
color:white;
z-index:100;
}
.messagepop {
background-color:#FFFFFF;
border:1px solid #999999;
cursor:default;
display:none;
margin-top: 15px;
position:absolute;
text-align:left;
width:394px;
z-index:50;
padding: 25px 25...
Using multiple arguments for string formatting in Python (e.g., '%s … %s')
...
Also starting with Python 2.7 he can drop the index number, i.e. use a plain '{} in {}' format string.
– Cristian Ciupitu
May 31 '15 at 8:11
add a...