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In-place type conversion of a NumPy array
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You can make a view with a different dtype, and then copy in-place into the view:
import numpy as np
x = np.arange(10, dtype='int32')
y = x.view('float32')
y[:] = x
print(y)
yields
array([ 0., 1., 2., 3., 4., 5., 6., 7., 8., 9.], dtype=float32)
To show ...
How to get Core Data object from specific Object ID?
...se comment.)
[eta.: Another important difference between the first method and the other two is that existingObjectWithID:error: never returns a fault; it always fetches the whole object for you. If you're trying to avoid that (e.g. working with an expensive-to-fetch object with a big blob property)...
Why use sprintf function in PHP?
..., specify number format (hex, decimal, octal), number of decimals, padding and more. Google for printf and you'll find plenty of examples. The wikipedia article on printf should get you started.
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count vs length vs size in a collection
From using a number of programming languages and libraries I have noticed various terms used for the total number of elements in a collection.
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memcpy() vs memmove()
I am trying to understand the difference between memcpy() and memmove() , and I have read the text that memcpy() doesn't take care of the overlapping source and destination whereas memmove() does.
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Plotting with seaborn using the matplotlib object-oriented interface
...wo classes
"Axes-level" functions, including regplot, boxplot, kdeplot, and many others
"Figure-level" functions, including lmplot, factorplot, jointplot and one or two others
The first group is identified by taking an explicit ax argument and returning an Axes object. As this suggests, you can...
How can I determine the current line number in JavaScript?
...nism for determining the line number of the currently executing statement (and if so, what is it)?
8 Answers
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case-insensitive list sorting, without lowercasing the result?
... sorted(unsorted_list, key=lambda s: s.lower())
It works for both normal and unicode strings, since they both have a lower method.
In Python 2 it works for a mix of normal and unicode strings, since values of the two types can be compared with each other. Python 3 doesn't work like that, though: ...
When correctly use Task.Run and when just async-await
...ait Task.Run(() => DoWork());
Methods that are a mixture of CPU-bound and I/O-bound should have an Async signature with documentation pointing out their CPU-bound nature:
// Documentation: This method is CPU-bound.
Task DoWorkAsync();
Which you would also call using Task.Run (since it is par...
Best way to combine two or more byte arrays in C#
... - 0.0781270 seconds
I increased the size of each array to 100 elements and re-ran the test:
New Byte Array using System.Array.Copy - 0.2812554 seconds
New Byte Array using System.Buffer.BlockCopy - 0.2500048 seconds
IEnumerable<byte> using C# yield operator - 0.0625012 seconds...