大约有 48,000 项符合查询结果（耗时：0.0966秒） [XML]
Why does the indexing start with zero in 'C'?
...
Keith Thompson
221k3333 gold badges352352 silver badges557557 bronze badges
answered Sep 6 '11 at 13:29
Massimiliano PelusoMassimiliano P...
Check if checkbox is checked with jQuery
... |
edited Dec 31 '15 at 8:41
depankur rawat
1788 bronze badges
answered Feb 5 '10 at 0:31
...
UITableViewCell subview disappears when cell is selected
...
edited Jan 31 '18 at 11:25
Søren Mortensen
1,36511 gold badge99 silver badges2222 bronze badges
answer...
How do I run all Python unit tests in a directory?
...
15 Answers
15
Active
...
Is Integer Immutable
...
95
Immutable does not mean that a can never equal another value. For example, String is immutable t...
Make copy of an array
...ve an array a which is constantly being updated. Let's say a = [1,2,3,4,5] . I need to make an exact duplicate copy of a and call it b . If a were to change to [6,7,8,9,10] , b should still be [1,2,3,4,5] . What is the best way to do this? I tried a for loop like:
...
How do I compare two strings in Perl?
...
Sinan ÜnürSinan Ünür
112k1515 gold badges183183 silver badges321321 bronze badges
...
Remove trailing zeros
...
Dog EarsDog Ears
8,31655 gold badges3333 silver badges4949 bronze badges
...
Converting string to numeric [duplicate]
...g a problem with factors. For example,
> x = factor(4:8)
> x
[1] 4 5 6 7 8
Levels: 4 5 6 7 8
> as.numeric(x)
[1] 1 2 3 4 5
> as.numeric(as.character(x))
[1] 4 5 6 7 8
Some comments:
You mention that your vector contains the characters "Down" and "NoData". What do expect/want as.num...