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How do you extract a column from a multi-dimensional array?
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>>> import numpy as np
>>> A = np.array([[1,2,3,4],[5,6,7,8]])
>>> A
array([[1, 2, 3, 4],
[5, 6, 7, 8]])
>>> A[:,2] # returns the third columm
array([3, 7])
See also: "numpy.arange" and "reshape" to allocate memory
Example: (Allocating a ar...
GraphViz - How to connect subgraphs?
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197
The DOT user manual gives the following example of a graph with clusters with edges between cl...
How to implement a queue with three stacks?
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SUMMARY
O(1) algorithm is known for 6 stacks
O(1) algorithm is known for 3 stacks, but using lazy evaluation which in practice corresponds to having extra internal data structures, so it does not constitute a solution
People near Sedge...
How do I get a human-readable file size in bytes abbreviation using .NET?
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19 Answers
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How to pass parameters to a partial view in ASP.NET MVC?
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edited Oct 29 '13 at 15:01
Michał Powaga
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Float vs Decimal in ActiveRecord
...esent a Float. It's like a scientific notation for binary (something like +1.43*10^2). Because of that, it is impossible to store fractions and decimals in Float exactly.
That's why there is a Decimal format. If you do this:
irb:001:0> "%.47f" % (1.0/10)
=> "0.100000000000000005551115123125...
Why is using the rails default_scope often recommend against?
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193
Problem 1
Lets consider the basic example:
class Post < ActiveRecord::Base
default_sco...
How to do a case sensitive search in WHERE clause (I'm using SQL Server)?
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177
Can be done via changing the Collation. By default it is case insensitive.
Excerpt from the l...