大约有 47,000 项符合查询结果（耗时：0.0520秒） [XML]
How to quit scala 2.11.0 REPL?
In the last version of scala (2.10.3) REPL, I can type exit to quit from REPL. However, in Scala 2.11.0 this doesn't work.
...
deleting rows in numpy array
...numpy.delete method.
Suppose I have the following array x:
x = array([[1,2,3],
[4,5,6],
[7,8,9]])
To delete the first row, do this:
x = numpy.delete(x, (0), axis=0)
To delete the third column, do this:
x = numpy.delete(x,(2), axis=1)
So you could find the indices of the row...
To find whether a column exists in data frame or not
...
202
Assuming that the name of your data frame is dat and that your column name to check is "d", yo...
Add to Array jQuery
...
For JavaScript arrays, you use push().
var a = [];
a.push(12);
a.push(32);
For jQuery objects, there's add().
$('div.test').add('p.blue');
Note that while push() modifies the original array in-place, add() returns a new jQuery object, it does not modify the original one.
...
How to merge 2 List and removing duplicate values from it in C#
...
295
Have you had a look at Enumerable.Union
This method excludes duplicates from the return set. ...
How to click first link in list of items after upgrading to Capybara 2.0?
...al .item's so it raises an exception. I consider this behavior of Capybara 2 very good.
share
|
improve this answer
|
follow
|
...
Uninstall old versions of Ruby gems
...
|
edited Dec 28 '13 at 23:39
Steven Penny
76.1k4545 gold badges296296 silver badges336336 bronze badges
...
How to express infinity in Ruby?
...
If you use ruby 1.9.2, you can use:
>> Float::INFINITY #=> Infinity
>> 3 < Float::INFINITY #=> true
Or you can create your own constant using the following*:
I've checked that in Ruby 1.8.6, 1.8.7, and 1.9.2 you have Floa...
How can I create a correlation matrix in R?
I have 92 set of data of same type.
5 Answers
5
...
leading zeros in rails
...ed with padstr; otherwise, returns str.
some_int = 5
some_int.to_s.rjust(2, '0') # => '05'
some_int.to_s.rjust(5, '0') # => '00005'
another_int = 150
another_int.to_s.rjust(2, '0') # => '150'
another_int.to_s.rjust(3, '0') # => '150'
another_int.to_s.rjust(5, '0') # => '00150'
...