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What does “@@ -1 +1 @@” mean in Git's diff output?
...to-file to-file-modification-time
The time stamp looks like 2002-02-21 23:30:39.942229878 -0800 to indicate the date, time with fractional seconds, and time zone. The fractional seconds are omitted on hosts that do not support fractional time stamps.
You can change the header's content wi...
Passing command line arguments to R CMD BATCH
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115
My impression is that R CMD BATCH is a bit of a relict. In any case, the more recent Rscript e...
Can't install Ruby under Lion with RVM – GCC issues
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16 Answers
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Logical operators for boolean indexing in Pandas
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219
When you say
(a['x']==1) and (a['y']==10)
You are implicitly asking Python to convert (a['x'...
How to get the anchor from the URL using jQuery?
...se the .indexOf() and .substring(), like this:
var url = "www.aaa.com/task1/1.3.html#a_1";
var hash = url.substring(url.indexOf("#")+1);
You can give it a try here, if it may not have a # in it, do an if(url.indexOf("#") != -1) check like this:
var url = "www.aaa.com/task1/1.3.html#a_1", idx = u...
Python Dictionary Comprehension
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>>> d = {n: n**2 for n in range(5)}
>>> print d
{0: 0, 1: 1, 2: 4, 3: 9, 4: 16}
If you want to set them all to True:
>>> d = {n: True for n in range(5)}
>>> print d
{0: True, 1: True, 2: True, 3: True, 4: True}
What you seem to be asking for is a way to set...
how to change default python version?
...onfusing that when I type python -V in Terminal it says that Python 2.6.1 , how can I change the default python version?
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Ruby: What is the easiest way to remove the first element from an array?
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11 Answers
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Mean per group in a data.frame [duplicate]
...aggregate was designed for:
d <- read.table(text=
'Name Month Rate1 Rate2
Aira 1 12 23
Aira 2 18 73
Aira 3 19 45
Ben 1 53 19
Ben 2 22 87
Ben 3 19 45
Cat 1 22 ...
What does it mean by select 1 from table?
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15 Answers
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