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Fastest way to replace NAs in a large data.table
...le) # v1.6.6
require(gdata) # v2.8.2
set.seed(1)
dt1 = create_dt(2e5, 200, 0.1)
dim(dt1)
[1] 200000 200 # more columns than Ramnath's answer which had 5 not 200
f_andrie = function(dt) remove_na(dt)
f_gdata = function(dt, un = 0) gdata::NAToUnknown(dt, un)
f_dowle = function(dt) { ...
decorators in the python standard lib (@deprecated specifically)
...
59
Here's some snippet, modified from those cited by Leandro:
import warnings
import functools
d...
How to show first commit by 'git log'?
...parate tools, git-gui, gitweb, and git-p4). In this case, we know that e83c516 is the one we are probably interested in. It is both the earliest commit and a root commit.
It is not so simple in the general case.
Imagine that libfoo has been in development for a while and keeps its history in a Git...
Determine the data types of a data frame's columns
...is makes the example exactly reproducible
my.data <- data.frame(y=rnorm(5),
x1=c(1:5),
x2=c(TRUE, TRUE, FALSE, FALSE, FALSE),
X3=letters[1:5])
@Wilmer E Henao H's solution is very streamlined:
sapply(my.data, class)
...
Create a string of variable length, filled with a repeated character
...
answered Jan 15 '13 at 17:59
PointyPointy
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...
How to add 2 buttons into the UINavigationbar on the right side without IB?
...
With iOS 5+ it's as easy as:
UIBarButtonItem *btnShare = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemAction target:self action:@selector(share)];
UIBarButtonItem *btnRefresh = [[UIBarButtonItem alloc] in...
What's the fastest way to convert String to Number in JavaScript?
...
195
There are 4 ways to do it as far as I know.
Number(x);
parseInt(x, 10);
parseFloat(x);
+x;
By...
How to convert milliseconds into human readable form?
...
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edited Feb 25 '13 at 3:19
answered Oct 6 '08 at 18:28
...
2025年9月2日签到记录贴 - 签到区 - 清泛IT社区，为创新赋能！
...生成的,如果您还未签到,请点此进行签到的操作. 我在 2025-09-02 06:36 完成签到,是今天第一个签到的用户,获得随机奖励 小红花 4,另外我还额外获得了 小红花 10.我今天最想说:「该会员没有填写今日想说内容.」. 我在 2025-09-02 08:02 ...
Android -Starting Service at Boot Time
...er Knego
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