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Split a vector into chunks in R
...ks of size 20:
split(d, ceiling(seq_along(d)/20))
More details: I think all you need is seq_along(), split() and ceiling():
> d <- rpois(73,5)
> d
[1] 3 1 11 4 1 2 3 2 4 10 10 2 7 4 6 6 2 1 1 2 3 8 3 10 7 4
[27] 3 4 4 1 1 7 2 4 6 0 5 7 4 6 8 4 7 1...
String Concatenation using '+' operator
... code:
string x = "hello";
string y = "there";
string z = "chaps";
string all = x + y + z;
actually gets compiled as:
string x = "hello";
string y = "there";
string z = "chaps";
string all = string.Concat(x, y, z);
(Gah - intervening edit removed other bits accidentally.)
The benefit of the C...
How does the ARM architecture differ from x86? [closed]
Is the x86 Architecture specially designed to work with a keyboard while ARM expects to be mobile? What are the key differences between the two?
...
How to remove an item for a OR'd enum?
...amp; it with the ~ (complement) of 'BLUE'.
The complement operator essentially reverses or 'flips' all bits for the given data type. As such, if you use the AND operator (&) with some value (let's call that value 'X') and the complement of one or more set bits (let's call those bits Q and thei...
MongoDB Many-to-Many Association
... user document:
{name:"Joe"
,roles:["Admin","User","Engineer"]
}
To get all the Engineers, use:
db.things.find( { roles : "Engineer" } );
If you want to maintain the roles in separate documents then you can include the document's _id in the roles array instead of the name:
{name:"Joe"
,roles:...
How do I pronounce “=>” as used in lambda expressions in .Net
...
I usually say 'such that' when reading that operator.
In your example, p => p.Age > 16 reads as "P, such that p.Age is greater than 16."
In fact, I asked this very question on the official linq pre-release forums, and Ande...
Numpy argsort - what is it doing?
...
[2, 3, 1, 0] indicates that the smallest element is at index 2, the next smallest at index 3, then index 1, then index 0.
There are a number of ways to get the result you are looking for:
import numpy as np
import scipy.stats as stats
def using_indexed_ass...
Controlling mouse with Python
...
Tested on WinXP, Python 2.6 (3.x also tested) after installing pywin32 (pywin32-214.win32-py2.6.exe in my case):
import win32api, win32con
def click(x,y):
win32api.SetCursorPos((x,y))
win32api.mouse_event(win32con.MOUSEEVENTF_LEFTDOWN,x,y,0,0)
win32api.mouse_event(win...
What's the difference between Spring Data's MongoTemplate and MongoRepository?
...goRepository but struggled with complex queries to find examples or to actually understand the Syntax.
3 Answers
...
Convert stdClass object to array in PHP
...ncode($object), true);
Or if you prefer, you can traverse the object manually, too:
foreach ($object as $value)
$array[] = $value->post_id;
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