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pandas: How do I split text in a column into multiple rows?
...olution:
time python -c "import pandas as pd;
df = pd.DataFrame(['a b c']*100000, columns=['col']);
print df['col'].apply(lambda x : pd.Series(x.split(' '))).head()"
... compared to this alternative:
time python -c "import pandas as pd;
from scipy import array, concatenate;
df = pd.DataFrame(['a...
How to set a default entity property value with Hibernate
...olumn(name = "myColumn", nullable = false, columnDefinition = "int default 100")
Notice that the string in columnDefinition is database dependent. Also if you choose this option, you have to use dynamic-insert, so Hibernate doesn't include columns with null values on insert. Otherwise talking abo...
Can I change the size of UIActivityIndicator?
...! thx! I also set UIActivityIndicatorView(frame: CGRect(x: 0, y: 0, width: 100, height: 100)) and activityIndicator.backgroundColor = UIColor(red: 255/255, green: 255/255, blue: 255/255, alpha: 0.38). On 6+/7+ screens the default one is just too tiny
– rockhammer
...
When should I use Lazy?
...636 6.72
InitInterp 0.08481 0.084908 0.099328 0.098626 0.083774 0.0902892 100.00
InitLazy 0.058436 0.05891 0.068046 0.068108 0.060648 0.0628296 69.59
Test 2 Results: First Get (average of 20 property gets)
Class 1 2 3 4 5 Avg %
-----------------...
Why does 2 mod 4 = 2?
...ainder of 3)
50 % 50 evaluates to 0 (50/50 is 1 with a remainder of 0)
9 % 100 evaluates to 9 (9/100 is 0 with a remainder of 9)
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How can I specify the base for Math.log() in JavaScript?
... with floating point math. I just tried the function above with a value of 1000 in node, and got a result of 2.9999999999999996. (Although other numbers I tried, such as 10, 100, and even 10000, came out with correct values.)
– user4815162342
Apr 13 '13 at 14:4...
Http长连接200万尝试及调优 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...Network: eth0 (bnx2):Broadcom NetXtreme II BCM5709 Gigabit Ethernet,1000Mb/s
OS: RHEL Server 5.4 (Tikanga), Linux 2.6.18-164.el5 x86_64, 64-bit
服务端程序很简单，基于nginx写的一个comet模块，该模块接受用户的请求，然后保持用户的连接，...
Hide div after a few seconds
...
This will hide the div after 1 second (1000 milliseconds).
setTimeout(function() {
$('#mydiv').fadeOut('fast');
}, 1000); // <-- time in milliseconds
#mydiv{
width: 100px;
height: 100px;
background: #000;
color: #fff;
text-a...
How can I prevent the textarea from stretching beyond his parent DIV element? (google-chrome issue o
... resize: horizontal;
}
Or you can limit size:
textarea {
max-width: 100px;
max-height: 100px;
}
To limit size to parents width and/or height:
textarea {
max-width: 100%;
max-height: 100%;
}
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How to format numbers by prepending 0 to single-digit numbers?
...rn output;
}
Examples:
leftPad(1, 2) // 01
leftPad(10, 2) // 10
leftPad(100, 2) // 100
leftPad(1, 3) // 001
leftPad(1, 8) // 00000001
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