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git ahead/behind info between master and branch?
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324
Here's a trick I found to compare two branches and show how many commits each branch is ahead o...
Order data frame rows according to vector with specific order
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236
Try match:
df <- data.frame(name=letters[1:4], value=c(rep(TRUE, 2), rep(FALSE, 2)))
targe...
How to see which flags -march=native will activate?
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152
You can use the -Q --help=target options:
gcc -march=native -Q --help=target ...
The -v optio...
how does multiplication differ for NumPy Matrix vs Array classes?
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127
The main reason to avoid using the matrix class is that a) it's inherently 2-dimensional, and b...
Update multiple rows in same query using PostgreSQL
...zable:
update test as t set
column_a = c.column_a
from (values
('123', 1),
('345', 2)
) as c(column_b, column_a)
where c.column_b = t.column_b;
You can add as many columns as you like:
update test as t set
column_a = c.column_a,
column_c = c.column_c
from (values
('123...
How can I get nth element from a list?
...
Look here, the operator used is !!.
I.e. [1,2,3]!!1 gives you 2, since lists are 0-indexed.
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Is there a difference between x++ and ++x in java?
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293
++x is called preincrement while x++ is called postincrement.
int x = 5, y = 5;
System.out....
Latest jQuery version on Google's CDN
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182
UPDATE 7/3/2014: As of now, jquery-latest.js is no longer being updated.
From the jQuery blog:
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tmux: How to join two tmux windows into one, as panes?
...ually I found the way to do that. Suppose the two windows are number 1 and 2. Use
join-pane -s 2 -t 1
This will move the 2nd window as a pane to the 1st window. The opposite command is break-pane
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Exit a Script On Error
...ho ERROR: Failed to sign $jar_file. Please recheck the variables 1>&2
exit 1 # terminate and indicate error
fi
...
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