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Assign multiple columns using := in data.table, by group
... col1 col2 mean sum Name1 Longer%
# 1: 1 1 hi hello 2.5 5 10 15
# 2: 2 2 hi hello 3.5 7 14 21
# 3: 3 3 hi hello 4.5 9 18 27
# 4: 1 4 hi hello 2.5 5 10 15
# 5: 2 5 hi hello 3.5 7 14 21
# 6: 3 6 hi hello 4.5 9 18 27
x[ ...
Python - Create list with numbers between 2 values?
...ns a list so all you need is:
>>> range(11, 17)
[11, 12, 13, 14, 15, 16]
In Python 3.x range is a iterator. So, you need to convert it to a list:
>>> list(range(11, 17))
[11, 12, 13, 14, 15, 16]
Note: The second number is exclusive. So, here it needs to be 16+1 = 17
EDIT:
T...
“unrecognized import path” with go get
...
15
You should almost never set GOROOT. Your PATH declaration doesn't hit /usr/local/go/bin. Also, should note that the ubuntu packages are a b...
Datatype for storing ip address in SQL Server
...l display form to binary:
CREATE FUNCTION dbo.fnBinaryIPv4(@ip AS VARCHAR(15)) RETURNS BINARY(4)
AS
BEGIN
DECLARE @bin AS BINARY(4)
SELECT @bin = CAST( CAST( PARSENAME( @ip, 4 ) AS INTEGER) AS BINARY(1))
+ CAST( CAST( PARSENAME( @ip, 3 ) AS INTEGER) AS BINARY(1))
...
How do you specify the Java compiler version in a pom.xml file?
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edited Jul 23 '15 at 8:19
Michel
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an...
What's the difference between tilde(~) and caret(^) in package.json?
...ur production code.
– tehfoo
Feb 9 '15 at 18:33
13
You can also just do away with all the nonsens...
Standard deviation of a list
...
153
Since Python 3.4 / PEP450 there is a statistics module in the standard library, which has a me...
HTML img scaling
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edited Oct 1 '15 at 22:22
Volker E.
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...
Slicing of a NumPy 2d array, or how do I extract an mxm submatrix from an nxn array (n>m)?
...on. The buffer assigned to x will contain 16 ascending integers from 0 to 15. If you access one element, say x[i,j], NumPy has to figure out the memory location of this element relative to the beginning of the buffer. This is done by calculating in effect i*x.shape[1]+j (and multiplying with the ...
How can I get the intersection, union, and subset of arrays in Ruby?
...
155
Utilizing the fact that you can do set operations on arrays by doing &(intersection), -(di...