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Eclipse: Referencing log4j.dtd in log4j.xml
...nnection (at least at some point during development, even if it's just one time).
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MySQL: What's the difference between float and double?
...----+-------------+
For first difference, we try to insert a record with '1.2' to each field:
INSERT INTO `test` values (1.2,1.2,1.2,1.2);
The table showing like this:
SELECT * FROM `test`;
+------+------+------+------+
| fla | flb | dba | dbb |
+------+------+------+------+
| 1.2 | 1.2 | 1...
Checking for empty queryset in Django
...
If you have a huge number of objects, this can (at times) be much faster:
try:
orgs[0]
# If you get here, it exists...
except IndexError:
# Doesn't exist!
On a project I'm working on with a huge database, not orgs is 400+ ms and orgs.count() is 250ms. In my mos...
Fastest way to iterate over all the chars in a String
... of 2020-09-07, on my Ryzen 1950-X 16 core and source 1.14, 'charAt1' is 9 times slower than field access and 'charAt2' is 4 times slower than field access. Field access is back as the clear winner. Note than the program will need to use byte[] access for Java 9+ version jvms.
It all depends on the ...
Peak signal detection in realtime timeseries data
...re between 0 and 1.
It works as follows:
Pseudocode
# Let y be a vector of timeseries data of at least length lag+2
# Let mean() be a function that calculates the mean
# Let std() be a function that calculates the standard deviaton
# Let absolute() be the absolute value function
# Settings (the one...
How to go about formatting 1200 to 1.2k in java
... long truncated = value / (divideBy / 10); //the number part of the output times 10
boolean hasDecimal = truncated < 100 && (truncated / 10d) != (truncated / 10);
return hasDecimal ? (truncated / 10d) + suffix : (truncated / 10) + suffix;
}
Test code
public static void main(String a...
Get the length of a String
...ments() gets the actual number of Unicode characters. However, most of the time all of the above alternatives will return the same results, specially if you're are working with English language common characters.
– Cezar
Jun 6 '14 at 13:32
...
PHP YAML Parsers [closed]
...ad clear error messages."
spyc: YAML parser without dependencies
At the time of this writing, the latest versions release dates for the aforementioned libraries and the versions of the YAML spec (1.2 is the latest version) they support are:
php-yaml 1.3.0 2016-09-24 YAML 1.1 [PHP 5]
p...
代码块超1.2w，编译apk报错 - 用户反馈 - 清泛IT社区，为创新赋能！
代码块超1.2w，编译apk报错
直接保存，http头300多K
编译，生成yail，头1.2M
What do “branch”, “tag” and “trunk” mean in Subversion repositories?
...plan, they are usually merged back into the trunk.
Tag will be a point in time on the trunk or a branch that you wish to preserve. The two main reasons for preservation would be that either this is a major release of the software, whether alpha, beta, RC or RTM, or this is the most stable point of ...