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Select multiple columns in data.table by their numeric indices
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It's a bit verbose, but i've gotten used to using the hidden .SD variable.
b<-data.table(a=1,b=2,c=3,d=4)
b[,.SD,.SDcols=c(1:2)]
It's a bit of a hassle, but you don't lose out on other data.table features (I don't think), so you should still be able to use other important ...
@RunWith(MockitoJUnitRunner.class) vs MockitoAnnotations.initMocks(this)
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MockitoJUnitRunner gives you automatic validation of framework usage, as well as an automatic initMocks().
The automatic validation of framework usage is actually worth having. It gives you better reporting if you make one of these mistakes.
You call the static w...
Can mustache iterate a top-level array?
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this one is right, and very usefully for multidimensional rendering. Please find my example as below
– Bhupender Keswani
Nov 8 '17 at 8:40
add a ...
What is a tracking branch?
... master
and a remote tracking branch like origin/master
Then you can consider master as a local tracking branch: It tracks the remote tracking branch origin/master which, in turn, tracks the master branch of the upstream repo origin.
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Difference between except: and except Exception as e: in Python
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I never said that it did. I haven't once mentioned the as e, because I assumed it's obvious what it does.
– Veedrac
Sep 24 '13 at 13:28
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How to print the current Stack Trace in .NET without any exception?
... edited Feb 2 '15 at 4:25
David Gardiner
15.8k1414 gold badges6969 silver badges114114 bronze badges
answered Feb 10 '09 at 9:47
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Using Transactions or SaveChanges(false) and AcceptAllChanges()?
...alse) fails, AcceptAllChanges() will never be called and EF will still consider your object as having properties that were changed and need to be saved back to the database.
– BlueRaja - Danny Pflughoeft
Mar 29 '10 at 15:22
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Using git commit -a with vim
I'm new with git, so I decided to learn git using the tutorials of github. The third chapter said:
6 Answers
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How do DATETIME values work in SQLite?
I’m creating Android apps and need to save date/time of the creation record. The SQLite docs say, however, "SQLite does not have a storage class set aside for storing dates and/or times" and it's "capable of storing dates and times as TEXT, REAL, or INTEGER values".
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The apk must be signed with the same certificates as the previous version
I had uploaded my app to Google Play (back when it was called Android Market) some time ago.
11 Answers
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