大约有 43,000 项符合查询结果（耗时：0.0508秒） [XML]
Why does SIGPIPE exist?
...|
edited Oct 26 '16 at 9:13
Ton van den Heuvel
8,39155 gold badges3434 silver badges7575 bronze badges
a...
Difference between Eclipse Europa, Helios, Galileo
...June 2014 4.4 Luna Projects
Kepler 26 June 2013 4.3 Kepler Projects
Juno 27 June 2012 4.2 Juno Projects
Indigo 22 June 2011 3.7 Indigo projects
Helios 23 June 2010 3.6 ...
Grouping functions (tapply, by, aggregate) and the *apply family
...
1344
+100
R has ...
Why is it slower to iterate over a small string than a small list?
...n a list of small single character strings. Any explanation? It's almost 1.35 times as much time.
3 Answers
...
Apply a function to every row of a matrix or a data frame
...
You simply use the apply() function:
R> M <- matrix(1:6, nrow=3, byrow=TRUE)
R> M
[,1] [,2]
[1,] 1 2
[2,] 3 4
[3,] 5 6
R> apply(M, 1, function(x) 2*x[1]+x[2])
[1] 4 10 16
R>
This takes a matrix and applies a (silly) function to each row. You pass extr...
List of lists changes reflected across sublists unexpectedly
...
593
When you write [x]*3 you get, essentially, the list [x, x, x]. That is, a list with 3 references...
Eclipse RCP Plug-in开发自学教程（Eclipse3.6） - 文档下载 - 清泛网 - ...
Eclipse RCP Plug-in开发自学教程（Eclipse3.6） Eclipse RCP Plug-in本教程素材来源于网络，经过本人的整理、添加以及部分的重写，将原有的Eclipse3.3版本的一些内容完全迁移到Eclipse3.6版本上来。基于开源以...本教程素材来源于网络，经...
xkcd style graphs in MATLAB
...t a transformation.
%# define plot data
x = 1:0.1:10;
y1 = sin(x).*exp(-x/3) + 3;
y2 = 3*exp(-(x-7).^2/2) + 1;
%# plot
fh = figure('color','w');
hold on
plot(x,y1,'b','lineWidth',3);
plot(x,y2,'w','lineWidth',7);
plot(x,y2,'r','lineWidth',3);
xlim([0.95 10])
ylim([0 5])
set(gca,'fontName','Comic ...
How do I sort one vector based on values of another
... |
edited Oct 15 '09 at 0:31
answered Oct 14 '09 at 21:47
I...
How does java do modulus calculations with negative numbers?
Am I doing modulus wrong? Because in Java -13 % 64 is supposed to evaluate to -13 but I get 51 .
14 Answers
...