大约有 47,000 项符合查询结果（耗时：0.0582秒） [XML]
iPhone - Get Position of UIView within entire UIWindow
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edited Aug 25 '14 at 7:08
answered Sep 23 '09 at 11:32
Ni...
Append text to input field
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edited Oct 11 '18 at 8:04
Dream Hunter - hashADH
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how to provide a swap function for my class?
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edited Aug 22 at 8:06
Jan Schultke
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answe...
writing some characters like '
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edited Jul 7 '16 at 19:48
Hussein El Feky
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answ...
Associativity of “in” in Python?
... 6 DUP_TOP
7 ROT_THREE
8 COMPARE_OP 6 (in)
11 JUMP_IF_FALSE 8 (to 22) #if first comparison is wrong
#then jump to 22,
14 POP_TOP
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Does Notepad++ show all hidden characters?
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edited Jun 26 '18 at 18:47
Peter Mortensen
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JSR-303 @Valid annotation not working for list of child objects
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answered Feb 28 '11 at 14:04
RiteshRitesh
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Order discrete x scale by frequency/value
...different than:
# mtcars$cyl2 <- factor(mtcars$cyl, levels = c("6","4","8"))
# You can manually set the levels in whatever order you please.
ggplot(mtcars, aes(cyl2)) + geom_bar()
As James pointed out in his answer, reorder is the idiomatic way of reordering factor levels.
mtcars$cyl3 <-...
dplyr summarise: Equivalent of “.drop=FALSE” to keep groups with zero length in output
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Since dplyr 0.8 group_by gained the .drop argument that does just what you asked for:
df = data.frame(a=rep(1:3,4), b=rep(1:2,6))
df$b = factor(df$b, levels=1:3)
df %>%
group_by(b, .drop=FALSE) %>%
summarise(count_a=length(a))
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What is `git diff --patience` for?
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186
You can read a post from Bram Cohen, the author of the patience diff algorithm, but I found thi...