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Applying a function to every row of a table using dplyr?
...f Hadley's examples using pmap:
iris %>%
mutate(Max.Len= purrr::pmap_dbl(list(Sepal.Length, Petal.Length), max))
Using this approach, you can give an arbitrary number of arguments to the function (.f) inside pmap.
pmap is a good conceptual approach because it reflects the fact that when ...
Automatic Retina images for web sites
...
Usage sample:
.retina-background-image( "../references/Images/", "start_grey-97_12", ".png", 12px );
Ths requires you to have two files:
start_grey-97_12.png
start_grey-97_12@2x.png
Where the 2x file is double resolution for retina.
...
How can I produce an effect similar to the iOS 7 blur view?
...irect link: https://developer.apple.com/downloads/download.action?path=wwdc_2013/wwdc_2013_sample_code/ios_uiimageeffects.zip
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Event handling for iOS - how hitTest:withEvent: and pointInside:withEvent: are related?
...eturn self;
}
return nil;
}
Edit Swift 4:
override func hitTest(_ point: CGPoint, with event: UIEvent?) -> UIView? {
if self.point(inside: point, with: event) {
return super.hitTest(point, with: event)
}
guard isUserInteractionEnabled, !isHidden, alpha > 0 else {...
Why can't yield return appear inside a try block with a catch?
...ck");
}
Console.WriteLine("Post");
into (sort of pseudo-code):
case just_before_try_state:
try
{
Console.WriteLine("a");
}
catch (Something e)
{
CatchBlock();
goto case post;
}
__current = 10;
return true;
case just_after_yield_return:
...
Recursive lambda functions in C++11
...r, not by capture.
const auto sum = [term,next](int a, int b) {
auto sum_impl=[term,next](int a,int b,auto& sum_ref) mutable {
if(a>b){
return 0;
}
return term(a) + sum_ref(next(a),b,sum_ref);
};
return sum_impl(a,b,sum_impl);
};
All problems in computer science can...
namespaces for enum types - best practices
...m
{
Red,
Blue,
Green,
Yellow
} enum_type;
private:
enum_type _val;
public:
Color(enum_type val = Blue)
: _val(val)
{
assert(val <= Yellow);
}
operator enum_type() const
{
return _val;
}
};
void SetPenC...
If Python is interpreted, what are .pyc files?
...on at least. Also I wonder what Cython is.
– personal_cloud
Sep 29 '17 at 15:56
...
Disable all table constraints in Oracle
...m SQL*Plus or put this thing into a package or procedure. The join to USER_TABLES is there to avoid view constraints.
It's unlikely that you really want to disable all constraints (including NOT NULL, primary keys, etc). You should think about putting constraint_type in the WHERE clause.
BEGIN
...
How do I merge a git tag onto a branch
...
You mean this?
git checkout destination_branch
git merge tag_name
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