大约有 48,000 项符合查询结果（耗时：0.0814秒） [XML]
Multidimensional Array [][] vs [,] [duplicate]
...le[][] can validly be:
double[][] x = new double[5][];
x[0] = new double[10];
x[1] = new double[5];
x[2] = new double[3];
x[3] = new double[100];
x[4] = new double[1];
Because each entry in the array is a reference to an array of double. With a jagged array, you can do an assignment to an array ...
pandas dataframe columns scaling with sklearn
...rame({'A':[14.00,90.20,90.95,96.27,91.21],
'B':[103.02,107.26,110.35,114.23,114.68],
'C':['big','small','big','small','small']})
>>> dfTest[['A', 'B']] = scaler.fit_transform(dfTest[['A', 'B']])
>>> dfTest
A ...
Group by multiple columns in dplyr, using string vector input
...:
data = data.frame(
asihckhdoydkhxiydfgfTgdsx = sample(LETTERS[1:3], 100, replace=TRUE),
a30mvxigxkghc5cdsvxvyv0ja = sample(LETTERS[1:3], 100, replace=TRUE),
value = rnorm(100)
)
# get the columns we want to average within
columns = names(data)[-3]
library(dplyr)
df1 <- data %>...
ASP.NET MVC 3 Razor - Adding class to EditorFor
...
Jess
18.9k1515 gold badges101101 silver badges128128 bronze badges
answered Jan 2 '11 at 8:39
Darin DimitrovDarin Dimitrov
...
Java's final vs. C++'s const
... only e.g.:
public class Foo {
void bar() {
final int a;
a = 10;
}
}
is legal in Java, but not C++ whereas:
public class Foo {
void bar() {
final int a;
a = 10;
a = 11; // Not legal, even in Java: a has already been assigned a value.
}
}
In both Java and ...
How do I clone a subdirectory only of a Git repository?
...
10
@StijndeWitt: Sparse checkouts happen during git-read-tree, which is long after get-fetch. The question was not about checking out only a s...
How to get an absolute file path in Python
...
answered Sep 9 '08 at 10:21
sherbangsherbang
12.1k11 gold badge2020 silver badges1414 bronze badges
...
How to do joins in LINQ on multiple fields in single join
...
Jon SkeetJon Skeet
1210k772772 gold badges85588558 silver badges88218821 bronze badges
...
Is there a max array length limit in C++?
...
answered Oct 19 '08 at 10:44
Konrad RudolphKonrad Rudolph
461k117117 gold badges863863 silver badges11101110 bronze badges
...