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List of lists into numpy array
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205
If your list of lists contains lists with varying number of elements then the answer of Ignaci...
Syntax behind sorted(key=lambda: …)
...at of def to create a function.
adder_lambda = lambda parameter1,parameter2: parameter1+parameter2
def adder_regular(parameter1, parameter2): return parameter1+parameter2
lambda just gives us a way of doing this without assigning a name. Which makes it great for using as a parameter to a function...
Callback functions in C++
...sing appropriate callables for example:
std::vector<double> v{ 1.0, 2.2, 4.0, 5.5, 7.2 };
double r = 4.0;
std::for_each(v.begin(), v.end(), [&](double & v) { v += r; });
std::for_each(v.begin(), v.end(), [](double v) { std::cout << v << " "; });
which prints
5 6.2 8 9.5...
Unix's 'ls' sort by name
...bashrc - .config - .local - Downloads - can - tmp
– 12431234123412341234123
Aug 14 '17 at 10:15
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Using awk to print all columns from the nth to the last
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24 Answers
24
Active
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Create a dictionary with list comprehension
...y: value for (key, value) in iterable}
Note: this is for Python 3.x (and 2.7 upwards). Formerly in Python 2.6 and earlier, the dict built-in could receive an iterable of key/value pairs, so you can pass it a list comprehension or generator expression. For example:
dict((key, func(key)) for key in ...
What is the difference between print and puts?
...ot one already.
print does not add a new line.
For example:
puts [[1,2,3], [4,5,nil]] Would return:
1
2
3
4
5
Whereas print [[1,2,3], [4,5,nil]]
would return:
[[1,2,3], [4,5,nil]]
Notice how puts does not output the nil value whereas print does.
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How to get all subsets of a set? (powerset)
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26 Answers
26
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Remove an entire column from a data.frame in R
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421
You can set it to NULL.
> Data$genome <- NULL
> head(Data)
chr region
1 chr1 CD...
Equation for testing if a point is inside a circle
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In general, x and y must satisfy (x - center_x)^2 + (y - center_y)^2 < radius^2.
Please note that points that satisfy the above equation with < replaced by == are considered the points on the circle, and the points that satisfy the above equation with < replaced ...