大约有 40,000 项符合查询结果（耗时：0.0581秒） [XML]
Fastest way to remove first char in a String
... random strings, that you pre-populated an array (list) with, and randomly select the element of that array (list).
– ajeh
Sep 9 '16 at 19:51
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What does .SD stand for in data.table in R
...iping can be beautiful
library(Lahman)
Teams = as.data.table(Teams)
# *I'm selectively suppressing the printed output of tables here*
Teams
Pitching = as.data.table(Pitching)
# subset for conciseness
Pitching = Pitching[ , .(playerID, yearID, teamID, W, L, G, ERA)]
Pitching
Naked .SD
To illustrat...
How do I get logs/details of ansible-playbook module executions?
...separate from specifying a log file. It's even separate from the verbosity selection! This is still very good to call out - debug will give you developer-oriented debug messages, on absolutely extreme verbosity level. Good to have around.
– AlanSE
Aug 10 '18 at...
Why invoke Thread.currentThread.interrupt() in a catch InterruptException block?
...eceive a
ClosedByInterruptException.
If this thread is blocked in a Selector then the thread's interrupt
status will be set and it will return immediately from the selection
operation.
If none of the previous conditions hold then this thread's interrupt
status will be set.
So, if...
JdbcTemplate queryForInt/Long is deprecated in Spring 3.2.2. What should it be replaced by?
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public int getCircleCount() {
Object param = "1";
String sql = "select count(*) from circle where id = ? ";
jdbcTemplate.setDataSource(getDataSource());
int result = getJdbcTemplate().queryForObject(sql, new Object[] { param }, Integer.class);
return result;
}
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Eager load polymorphic
...edTable error ( tested in Rails 3, not 4 ) because the association will do SELECT FROM shops WHERE shop.id = 1 AND ( reviews.review_type = 'Shop' ).
The :include option will force a JOIN instead. :)
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Need for predictable random generator
... first plot as patterns, but they're not - they're just part of a randomly selected sample.
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SVG: text inside rect
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Programmatically using D3:
body = d3.select('body')
svg = body.append('svg').attr('height', 600).attr('width', 200)
rect = svg.append('rect').transition().duration(500).attr('width', 150)
.attr('height', 100)
.attr('x', 40)
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Chrome Dev Tools - Modify javascript and reload
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Open the Sources panel.
Open the Overrides tab.
Click Setup Overrides.
Select which directory you want to save your changes to.
At the top of your viewport, click Allow to give DevTools read and write access to the directory.
Make your changes."
UPDATE (March 19, 2018): It's live, detailed ...
Generate random numbers uniformly over an entire range
... 32767 values in the range, and the remaining 4017233 values will never be selected by this algorithm.
– Mooing Duck
Aug 1 '13 at 18:28
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