大约有 43,500 项符合查询结果（耗时：0.0520秒） [XML]
From ND to 1D arrays
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283
Use np.ravel (for a 1D view) or np.ndarray.flatten (for a 1D copy) or np.ndarray.flat (for an ...
How can I confirm a database is Oracle & what version it is using SQL?
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288
Run this SQL:
select * from v$version;
And you'll get a result like:
BANNER
----------...
AngularJS ngClass conditional
...sions like
ng-class="{'test': obj.value1 == 'someothervalue' || obj.value2 == 'somethingelse'}"
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How to reference a file for variables using Bash?
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248
The short answer
Use the source command.
An example using source
For example:
config.sh
...
Can I redirect the stdout in python into some sort of string buffer?
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211
from cStringIO import StringIO # Python3 use: from io import StringIO
import sys
old_stdout =...
How to get size of mysql database?
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1221
Run this query and you'll probably get what you're looking for:
SELECT table_schema "DB Name"...
Cleaning `Inf` values from an R dataframe
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121
Option 1
Use the fact that a data.frame is a list of columns, then use do.call to recreate a d...
Is there an R function for finding the index of an element in a vector?
...rks on vectors :
x <- sample(1:10)
x
# [1] 4 5 9 3 8 1 6 10 7 2
match(c(4,8),x)
# [1] 1 5
match only returns the first encounter of a match, as you requested. It returns the position in the second argument of the values in the first argument.
For multiple matching, %in% is the way to...
Capturing Groups From a Grep RegEx
...ing stored in a variable
else
echo "$f doesn't match" >&2 # this could get noisy if there are a lot of non-matching files
fi
done
It's better to put the regex in a variable. Some patterns won't work if included literally.
This uses =~ which is Bash's regex match operator. ...
What is the advantage of using abstract classes instead of traits?
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answered Jan 2 '10 at 11:53
Mushtaq AhmedMushtaq Ahmed
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