大约有 30,000 项符合查询结果（耗时：0.0284秒） [XML]
Log to the base 2 in python
... <built-in function log>
Namespace: Interactive
Docstring:
log(m>x m>[, base]) -> the logarithm of m>x m> to the given base.
If the base not specified, returns the natural logarithm (base e) of m>x m>.
In [25]: math.log(8,2)
Out[25]: 3.0
...
surface plots in matplotlib
...ays.
If all you have is a list of 3d points, rather than some function f(m>x m>, y) -> z, then you will have a problem because there are multiple ways to triangulate that 3d point cloud into a surface.
Here's a smooth surface em>x m>ample:
import numpy as np
from mpl_toolkits.mplot3d import Am>x m>es3D
...
How many concurrent requests does a single Flask process receive?
...t a time (1 thread), but objects can be 'paused' when they are waiting on em>x m>ternal processes to finish (think database queries or waiting on network I/O).
This means, if you're using one of Gunicorn's async workers, each worker can handle many more than a single request at a time. Just how many wo...
Object comparison in JavaScript [duplicate]
...ursively and access all non-enumerable properties, but this works in Firefom>x m> only.
So the best I can do is to guess usage scenarios.
1) Fast and limited.
Works when you have simple JSON-style objects without methods and DOM nodes inside:
JSON.stringify(obj1) === JSON.stringify(obj2)
The OR...
Accessing class variables from a list comprehension in the class definition
...ss scope and list, set or dictionary comprehensions, as well as generator em>x m>pressions do not mim>x m>.
The why; or, the official word on this
In Python 3, list comprehensions were given a proper scope (local namespace) of their own, to prevent their local variables bleeding over into the surrounding sc...
Geometric Mean: is there a built-in?
...ulating geometric mean in R. The verbose mean calculation involving length(m>x m>) is necessary for the cases where m>x m> contains non-positive values.
gm_mean = function(m>x m>, na.rm=TRUE){
em>x m>p(sum(log(m>x m>[m>x m> > 0]), na.rm=na.rm) / length(m>x m>))
}
Thanks to @ben-bolker for noting the na.rm pass-through and @Gr...
What does a lazy val do?
...
The difference between them is, that a val is em>x m>ecuted when it is defined whereas a lazy val is em>x m>ecuted when it is accessed the first time.
scala> val m>x m> = { println("m>x m>"); 15 }
m>x m>
m>x m>: Int = 15
scala> lazy val y = { println("y"); 13 }
y: Int = <lazy>
scala>...
When would anyone use a union? Is it a remnant from the C-only days?
I have learned but don't really get unions. Every C or C++ tem>x m>t I go through introduces them (sometimes in passing), but they tend to give very few practical em>x m>amples of why or where to use them. When would unions be useful in a modern (or even legacy) case? My only two guesses would be programming ...
When is the init() function run?
I've tried to find a precise em>x m>planation of what the init() function does in Go. I read what Effective Go says but I was unsure if I understood fully what it said. The em>x m>act sentence I am unsure is the following:
...
Numpy argsort - what is it doing?
...entation
Returns the indices that would sort an array.
2 is the indem>x m> of 0.0.
3 is the indem>x m> of 0.1.
1 is the indem>x m> of 1.41.
0 is the indem>x m> of 1.48.
share
|
improve this answer
|
...