大约有 47,000 项符合查询结果（耗时：0.0453秒） [XML]
Selecting with complex criteria from pandas.DataFrame
...>>> df
A B C
0 9 40 300
1 9 70 700
2 5 70 900
3 8 80 900
4 7 50 200
5 9 30 900
6 2 80 700
7 2 80 400
8 5 80 300
9 7 70 800
We can apply column operations and get boolean Series objects:
>>> df["B"] > 50
0 False
1 True
2 True
3 ...
Split delimited strings in a column and insert as new rows [duplicate]
... 1 a
## 2 1 b
## 3 1 c
## 4 2 a
## 5 2 c
## 6 3 b
## 7 3 d
## 8 4 e
## 9 4 f
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Annotating text on individual facet in ggplot2
...ta.frame(mpg = 15,wt = 5,lab = "Text",
cyl = factor(8,levels = c("4","6","8")))
p + geom_text(data = ann_text,label = "Text")
It should work without specifying the factor variable completely, but will probably throw some warnings:
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Pass a data.frame column name to a function
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ShaneShane
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Memoization in Haskell?
...fficiently the following function in Haskell, for large numbers (n > 108)
8 Answers
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What does curly brackets in the `var { … } = …` statements do?
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answered Mar 8 '13 at 10:09
BlenderBlender
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List comprehension: Returning two (or more) items for each item
...lambda x: x ** 2',
number=20)
2.69210777094
3.13900787874
1.62461071932
25.5944058287
29.2623711793
25.7211849286
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Batch script: how to check for admin rights
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Issues
blak3r / Rushyo's solution works fine for everything except Windows 8. Running AT on Wi...
How do I convert a Vector of bytes (u8) to a string
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To convert a slice of bytes to a string slice (assuming a UTF-8 encoding):
use std::str;
//
// pub fn from_utf8(v: &[u8]) -> Result<&str, Utf8Error>
//
// Assuming buf: &[u8]
//
fn main() {
let buf = &[0x41u8, 0x41u8, 0x42u8];
let s = match str::fro...