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Should I instantiate instance variables on declaration or in the constructor?
...lass. Instead, using Dependency Injection is preferable - i.e. letting someone else (another class/framework) instantiate and inject the dependencies in your class.
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How to duplicate a git repository? (without forking)
I have two repositories, and I need to copy whole of one onto the other empty one which has different access levels from the first one. The copy and the mother repository should not be linked together.
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IEnumerable vs List - What to Use? How do they work?
...3 types. stackoverflow.com/questions/2876616/…
– Bronek
Jan 6 '14 at 20:55
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@Bronek The answer...
How do I edit an existing tag message in git?
... `# get the second to last date, as the last one is the commit date` \
> git tag tag1 tag1^{} -a -f # finally, update the tag message, but save the date of the old one
>
> git rev-list --objects -g --no-walk --all
6bdcc34...
Speed up the loop operation in R
....time(dayloop2(X))
Result is
You can see that your version depends exponentially from nrow(X). Modified version has linear relation, and simple lm model predict that for 850,000 rows computation takes 6 minutes and 10 seconds.
Power of vectorization
As Shane and Calimo states in theirs answer...
For each row return the column name of the largest value
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One option using your data (for future reference, use set.seed() to make examples using sample reproducible):
DF <- data.frame(V1=c(2,8,1),V2=c(7,3,5),V3=c(9,6,4))
colnames(DF)[apply(DF,1,which.max)]
[1] "V3" "V1" "V2"
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How do I create a new GitHub repo from a branch in an existing repo?
...at you don't need to create a repo on Github, you can just push to a local one (i.e. git init instead of Github > New > ...)
– OJFord
Apr 19 '16 at 12:19
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How to fire AJAX request Periodically?
...setInterval(). If the first request hasn't completed and you start another one, you could end up in a situation where you have multiple requests that consume shared resources and starve each other. You can avoid this problem by waiting to schedule the next request until the last one has completed:
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Using Auto Layout in UITableView for dynamic cell layouts & variable row heights
...ignificantly more powerful than Interface Builder using layout anchors, or one of the fantastic open source APIs available on GitHub.
If you're adding constraints in code, you should do this once from within the updateConstraints method of your UITableViewCell subclass. Note that updateConstraints...
Haskell Type vs Data Constructor
... its arguments, and then uses those to construct a new value. If you have done any object-oriented programming, you should recognise this. In OOP, constructors also take some values as arguments and return a new value!
In this case, if we apply RGB to three values, we get a colour value!
Prelude&g...