大约有 43,300 项符合查询结果（耗时：0.0464秒） [XML]
Checkout subdirectories in Git?
...
121
Sparse checkouts are now in Git 1.7.
Also see the question “Is it possible to do a sparse c...
An efficient way to transpose a file in Bash
...
115
awk '
{
for (i=1; i<=NF; i++) {
a[NR,i] = $i
}
}
NF>p { p = NF }
END {...
How to flatten only some dimensions of a numpy array
...
129
Take a look at numpy.reshape .
>>> arr = numpy.zeros((50,100,25))
>>> arr.s...
Reusable library to get human readable version of file size?
... unit in ['','Ki','Mi','Gi','Ti','Pi','Ei','Zi']:
if abs(num) < 1024.0:
return "%3.1f%s%s" % (num, unit, suffix)
num /= 1024.0
return "%.1f%s%s" % (num, 'Yi', suffix)
Supports:
all currently known binary prefixes
negative and positive numbers
numbers larger tha...
Convert hyphens to camel case (camelCase)
...
13 Answers
13
Active
...
How to use GROUP BY to concatenate strings in SQL Server?
...
18 Answers
18
Active
...
Should I use a data.frame or a matrix?
...
177
Part of the answer is contained already in your question: You use data frames if columns (vari...
How do write IF ELSE statement in a MySQL query
...
150
You probably want to use a CASE expression.
They look like this:
SELECT col1, col2, (case wh...
undefined method `source_index' for Gem:Module (NoMethodError)
...to this problem myself while trying to upgrade an older Rails app from REE 1.8.7 to 1.9.3-p385. Oddly, Ruby 1.9.3-p327 works just fine. What it came down to was ruby-1.9.3-p385 had installed RubyGems version 2.0.2 for me, and 1.9.3-p327 has RubyGems v1.8.23 installed.
Gem.source_index has been depr...