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Convert a matrix to a 1 dimensional array
...little benchmark, as follows:
library(microbenchmark)
x=matrix(runif(1e4),100,100) # generate a 100x100 matrix
microbenchmark(y<-as.vector(x),y<-x[1:length(x)],y<-array(x),y<-c(x),times=1e4)
The first solution uses as.vector(), the second uses the fact that a matrix is stored as a con...
How to get current date & time in MySQL?
...ange, disk_space,
network_shares,date_time) VALUES('m1','ONLINE','ONLINE','100GB','ONLINE',now() )
or
INSERT INTO servers (server_name, online_status, exchange, disk_space,
network_shares,date_time) VALUES('m1', 'ONLINE', 'ONLINE', '100GB', 'ONLINE'
,CURRENT_TIMESTAMP() )
Replace date_time wit...
Return multiple columns from pandas apply()
..._test['size'].apply(sizes))
Test result are:
Separate df.apply():
100 loops, best of 3: 1.43 ms per loop
Return Series:
100 loops, best of 3: 2.61 ms per loop
Return tuple:
1000 loops, best of 3: 819 µs per loop
...
Throwing the fattest people off of an overloaded airplane.
...items on the heap. If we assume that passengers' weights will typically be 100 lbs or more, then it's unlikely that the heap will contain more than 30 items at any time.
The worst case would be if the passengers are presented in order from lowest weight to highest. That would require that every pas...
How to use CSS to surround a number with a circle?
...div class="numberCircle">1</div>
<div class="numberCircle">100</div>
<div class="numberCircle">10000</div>
<div class="numberCircle">1000000</div>
If you need to make the content longer or shorter, all you need to do is adjust the width of the c...
What do querySelectorAll and getElementsBy* methods return?
...t');
for(var i = 0; i < elems.length; i++) {
elems[i].style.size = '100px';
}
If you prefer something shorter, consider using jQuery:
$('.myElement').css('size', '100px');
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Can't connect to MySQL server error 111 [closed]
I installed mysql server on linux box IP = 192.168.1.100 but when i try to connect to this IP it alway error(111). but use localhost and 127.0.0.1 is OK.
...
Make a DIV fill an entire table cell
...atibility mode, and Chrome (not tested elsewhere):
<table style="width:100px"> <!-- Not actually necessary; just makes the example text shorter -->
<tr><td>test</td><td>test</td></tr>
<tr>
<td style="padding:0;">
<d...
Using jquery to get element's position relative to viewport
...() {
res = visibility($('#block'));
$('#x').text(Math.round(res[0] * 100) + '%');
$('#y').text(Math.round(res[1] * 100) + '%');
}, 100);
#block { width: 100px; height: 100px; border: 1px solid red; background: yellow; top: 50%; left: 50%; position: relative;
} #container { background: #E...
How to use timeit module
... random
random.seed('slartibartfast')
s = [random.random() for i in range(1000)]
timsort = list.sort
'''
>>> print min(timeit.Timer('a=s[:]; timsort(a)', setup=setup).repeat(7, 1000))
0.334147930145
Note that the series of statements makes a fresh copy of the unsorted data on every pass...