大约有 49,000 项符合查询结果（耗时：0.1118秒） [XML]
Understanding exactly when a data.table is a reference to (vs a copy of) another data.table
...avoid for large data, and why := and set() were introduced to data.table.
Now, with our copied newDT we can modify it by reference :
newDT
# a b
# [1,] 1 11
# [2,] 2 200
newDT[2, b := 400]
# a b # See FAQ 2.21 for why this prints newDT
# [1,] 1 11
# [2,] 2 400
.Internal(in...
Making 'git log' ignore changes for certain paths
...
It is implemented now (git 1.9/2.0, Q1 2014) with the introduction pathspec magic :(exclude) and its short form :! in commit ef79b1f and commit 1649612, by
Nguyễn Thái Ngọc Duy (pclouds), documentation can be found here.
You now can log e...
How should I ethically approach user password storage for later plaintext retrieval?
...flair"
a password with about 74 bits of entropy: "K:&$R^tt~qkD"
I know I'd prefer typing the phrase, and with copy-n-paste, the phrase is no less easy to use that the password either, so no loss there. Of course if your website (or whatever the protected asset is) doesn't need 77 bits of ent...
Check whether user has a Chrome extension installed
...re you executing the script that uses .connect() from a hosted script? I know Chrome tries hard not to do stuff with just local files that aren't hosted for security purposes. - Just checking.
– JamesEggers
Jun 9 '11 at 14:13
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How do I tell Maven to use the latest version of a dependency?
...
Now I know this topic is old, but reading the question and the OP supplied answer it seems the Maven Versions Plugin might have actually been a better answer to his question:
In particular the following goals could be of use...
Notification click: activity already open
...es on top of it will be closed and
this Intent will be delivered to the (now on top) old activity as a
new Intent.
For example, consider a task consisting of the activities: A, B, C, D.
If D calls startActivity() with an Intent that resolves to the
component of activity B, then C and D...
How can I swap positions of two open files (in splits) in vim?
..._|______|
| three |
| |
|__________________|
Now make either 'one' or 'two' the active window, then issue the command ctrl+w r. This 'rotates' the windows in the current row, leaving you with:
____________________
| two | one |
| | |
|___________|...
Split a python list into other “sublists” i.e smaller lists [duplicate]
...tually it is equivalent, except for a bug where the last batch is missing, now fixed.
– qris
Sep 1 '15 at 8:54
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How to remove element from array in forEach loop?
...s changes. In this example, once you delete the first 'a', index number 1 now becomes 'c'. Therefore the first 'b' is not even evaluated. Since you didn't try to delete it, it just happened to be ok, but that is not the way. You should iterate through a reverse copy of the array, and then delete it...
HTML table with fixed headers?
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@user5249203 I know you asked a few month ago but I had the same problem and it was due to border-collapse: see this : stackoverflow.com/questions/33777751/….
– archz
Nov 4 '16 at 9:59
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