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Detect if a NumPy array contains at least one non-numeric value?
...ny()
Edit: 30x faster:
import timeit
s = 'import numpy;a = numpy.arange(10000.).reshape((100,100));a[10,10]=numpy.nan'
ms = [
'numpy.isnan(a).any()',
'any(numpy.isnan(x) for x in a.flatten())']
for m in ms:
print " %.2f s" % timeit.Timer(m, s).timeit(1000), m
Results:
0.11 s num...
How to calculate a logistic sigmoid function in Python?
...eturn 1 / (1 + math.exp(-x))
....:
In [6]: %timeit -r 1 sigmoid(0.458)
1000000 loops, best of 1: 371 ns per loop
In [7]: %timeit -r 1 logistic.cdf(0.458)
10000 loops, best of 1: 72.2 µs per loop
In [8]: %timeit -r 1 expit(0.458)
100000 loops, best of 1: 2.98 µs per loop
As expected logist...
How to round to 2 decimals with Python?
...er up to a certain decimal place?
import math
v = 2.357
print(math.ceil(v*100)/100) # -> 2.36
print(math.floor(v*100)/100) # -> 2.35
or:
from math import floor, ceil
def roundDown(n, d=8):
d = int('1' + ('0' * d))
return floor(n * d) / d
def roundUp(n, d=8):
d = int('1' + (...
How to bind inverse boolean properties in WPF?
...
100
Have you considered an IsNotReadOnly property? If the object being bound is a ViewModel in a M...
Restore the state of std::cout after manipulating it
...
100
you need to #include <iostream> or #include <ios> then when required:
std::ios_ba...
Getting “Lock wait timeout exceeded; try restarting transaction” even though I'm not using a transac
...s you undo a messup and then fix the application. If I could give this guy 100 up votes for this issue which I had to fix NOW I would.
– Lizardx
May 26 '16 at 21:44
8
...
Reading/writing an INI file
...s.ini");
You can write some values like so:
MyIni.Write("DefaultVolume", "100");
MyIni.Write("HomePage", "http://www.google.com");
To create a file like this:
[MyProg]
DefaultVolume=100
HomePage=http://www.google.com
To read the values out of the INI file:
var DefaultVolume = MyIni.Read("DefaultV...
Reading binary file and looping over each byte
...ead, chunksize), b''), maxlen=0)
Example:
$ dd if=/dev/zero bs=1M count=1000 | python3 blackhole.py
It processes ~1.5 GB/s when chunksize == 32768 on my machine and only ~7.5 MB/s when chunksize == 1. That is, it is 200 times slower to read one byte at a time. Take it into account if you can ...
Pickle or json?
...SON being faster is outdated by a few years. stackoverflow.com/a/39607169/1007353
– JDiMatteo
Sep 22 '16 at 1:34
|
show 3 more comments
...
delete vs delete[] operators in C++
...ate memory allocated for array of objects
class ABC{}
ABC *ptr = new ABC[100]
when we say new ABC[100], compiler can get the information about how many objects that needs to be allocated(here it is 100) and will call the constructor for each of the objects created
but correspondingly if we simp...