大约有 40,000 项符合查询结果（耗时：0.0604秒） [XML]
Is R's apply family more than syntactic sugar?
...median uq max neval
f1(df) 28.02612 28.28589 28.46822 29.20458 32.54656 100
f2(df) 38.02241 41.42277 41.80008 42.05954 45.94273 100
apply, however, in most situation doesn't provide any speed increase, and in some cases can be even lot slower:
mat <- matrix(rnorm(1000000), nro...
How do I jump out of a foreach loop in C#?
...
32
foreach (var item in listOfItems) {
if (condition_is_met)
// Any processing you may need ...
Why is using the rails default_scope often recommend against?
...expected.
– Zack Xu
Nov 8 '17 at 18:32
add a comment
|
...
How to step through Python code to help debug issues?
...
answered Jun 19 '16 at 3:32
akDakD
82311 gold badge88 silver badges1414 bronze badges
...
Android SDK installation doesn't find JDK
...
32
Works for Windows XP as well. Thanks!
– Spidy
Feb 28 '11 at 16:02
...
What is Java String interning?
...a == c);
}
}
we have on the constant pool:
#2 = String #32 // abc
[...]
#32 = Utf8 abc
and main:
0: ldc #2 // String abc
2: astore_1
3: ldc #2 // String abc
5: astore_2
6: new #3 // class java/lang/St...
Find() vs. Where().FirstOrDefault()
I often see people using Where.FirstOrDefault() to do a search and grab the first element. Why not just use Find() ? Is there an advantage to the other? I couldn't tell a difference.
...
How to swap keys and values in a hash
...000/svg\"\u003e\u003cpath d=\"M46.1709 9.17788C46.1709 8.26454 46.2665 7.94324 47.1084 7.58816C47.4091 7.46349 47.7169 7.36433 48.0099 7.26993C48.9099 6.97997 49.672 6.73443 49.672 5.93063C49.672 5.22043 48.9832 4.61182 48.1414 4.61182C47.4335 4.61182 46.7256 4.91628 46.0943 5.50789C45.7307 4.9328 4...
How Can I Set the Default Value of a Timestamp Column to the Current Timestamp with Laravel Migratio
...
323
Given it's a raw expression, you should use DB::raw() to set CURRENT_TIMESTAMP as a default va...
Is there a “goto” statement in bash?
...oval section.
– Jon
Nov 8 '18 at 20:32
This answer should not be upvoted since it doesn't respond to the OP's question...