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What is the difference between map and flatMap and a good use case for each?
...es0: Array[String] = Array("Roses are red", "Violets are blue")
Now, map transforms an RDD of length N into another RDD of length N.
For example, it maps from two lines into two line-lengths:
rdd.map(_.length).collect
res1: Array[Int] = Array(13, 16)
But flatMap (loosely speaking) transfo...
Change one value based on another value in pandas
... call .apply() on an entire dataframe rather than on a single column:
def transform_row(r):
r.animal = 'wild ' + r.type
r.type = r.animal + ' creature'
r.age = "{} year{}".format(r.age, r.age > 1 and 's' or '')
return r
df.apply(transform_row, axis=1)
In[4]:
Out[4]:
an...
CSS3 Continuous Rotate Animation (Just like a loading sundial)
...ion 2s infinite linear;
}
@-webkit-keyframes rotation {
from {-webkit-transform: rotate(0deg);}
to {-webkit-transform: rotate(359deg);}
}
Also what might be more resemblant of the apple loading icon would be an animation that transitions the opacity/color of the stripes of gray instead ...
How do I pronounce “=>” as used in lambda expressions in .Net
...han sixteen."
In comments Steve Jessop mentioned 'maps to' in the case of transformations - so taking Anders' example:
x => x * 2;
would read
x maps to x times 2.
That does seem much closer to the actual intention of the code than 'becomes' for this case.
...
How to vertically align an image inside a div
...
A three-line solution:
position: relative;
top: 50%;
transform: translateY(-50%);
This applies to anything.
From here.
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What does `someObject.new` do in Java?
...d to Java in version 1.1 of the language they were originally defined as a transformation to 1.0 compatible code. If you look at an example of this transformation, I think it will make it a lot clearer how an inner class actually works.
Consider the code from Ian Roberts' answer:
public class Foo ...
How do I calculate the normal vector of a line segment?
...ion to get the normal vector.
The matrix representation of the general 2D transformation looks like this:
x' = x cos(t) - y sin(t)
y' = x sin(t) + y cos(t)
where (x,y) are the components of the original vector and (x', y') are the transformed components.
If t = 90 degrees, then cos(90) = 0 and ...
RootViewController Switch Transition Animation
...5 animations:^{
snapShot.layer.opacity = 0;
snapShot.layer.transform = CATransform3DMakeScale(1.5, 1.5, 1.5);
} completion:^(BOOL finished) {
[snapShot removeFromSuperview];
}];
}
in your app
if (!app) { app = (AppDelegate *)[[UIApplication sharedApplication] dele...
How does @synchronized lock/unlock in Objective-C?
...ynchronized(self) {
return [[myString retain] autorelease];
}
}
is transformed into:
- (NSString *)myString {
NSString *retval = nil;
pthread_mutex_t *self_mutex = LOOK_UP_MUTEX(self);
pthread_mutex_lock(self_mutex);
retval = [[myString retain] autorelease];
pthread_mutex_unlock(s...
How to vertically align into the center of the content of a div with defined width/height?
...
I found this solution in this article
.parent-element {
-webkit-transform-style: preserve-3d;
-moz-transform-style: preserve-3d;
transform-style: preserve-3d;
}
.element {
position: relative;
top: 50%;
transform: translateY(-50%);
}
It work like a charm if the height of eleme...