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Implementing slicing in __getitem__
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121
The __getitem__() method will receive a slice object when the object is sliced. Simply look at...
Is there an R function for finding the index of an element in a vector?
... that is equal to x . I know that one way to do this is: which(x == v)[[1]] , but that seems excessively inefficient. Is there a more direct way to do it?
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python numpy machine epsilon
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193
An easier way to get the machine epsilon for a given float type is to use np.finfo():
print(n...
What's the difference between lists enclosed by square brackets and parentheses in Python?
...A list is mutable, meaning you can change its contents:
>>> x = [1,2]
>>> x.append(3)
>>> x
[1, 2, 3]
while tuples are not:
>>> x = (1,2)
>>> x
(1, 2)
>>> x.append(3)
Traceback (most recent call last):
File "<stdin>", line 1, in <m...
Integrate ZXing in Android Studio
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edited May 4 '18 at 4:11
Faysal Ahmed
5,78655 gold badges2121 silver badges4040 bronze badges
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No secret option provided to Rack::Session::Cookie warning?
I am running Rails 3.2.3, Ruby 1.9 under Fedora 17. I get this warning, when I run rails s , and how do I fix?
7 Answers
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How to convert a set to a list in python?
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197
It is already a list
type(my_set)
>>> <type 'list'>
Do you want something li...
What does this square bracket and parenthesis bracket notation mean [first1,last1)?
I have seen number ranges represented as [first1,last1) and [first2,last2) .
4 Answers
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How to remove last n characters from every element in the R vector
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117
Here is an example of what I would do. I hope it's what you're looking for.
char_array = c("...
Asterisk in function call
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182
* is the "splat" operator: It takes a list as input, and expands it into actual positional arg...