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What does the “map” method do in Ruby?
...ach returned value from the block (the original object is unchanged unless you use map!):
[1, 2, 3].map { |n| n * n } #=> [1, 4, 9]
Array and Range are enumerable types. map with a block returns an Array. map! mutates the original array.
Where is this helpful, and what is the difference betw...
Can't compare naive and aware datetime.now()
I am trying to compare the current date and time with dates and times specified in models using comparison operators:
7 Ans...
Polymorphism in C++
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Understanding of / requirements for polymorphism
To understand polymorphism - as the term is used in Computing Science - it helps to start from a simple test for and definition of it. Consider:
Type1 x;
Type2 y;
f(x);
f(y);
Here, f() is to pe...
What is going wrong when Visual Studio tells me “xcopy exited with code 4”
I'm not very familiar with post-build events, so I'm a little confused as to what's going wrong with my program. When compiling in visual studio 2010, I get the following:
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Generate all permutations of a list without adjacent equal elements
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This is along the lines of Thijser's currently incomplete pseudocode. The idea is to take the most frequent of the remaining item types unless it was just taken. (See also Coady's implementation of this algorithm.)
import collections
import heapq
class Sentinel:
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How do I parse XML in Python?
I have many rows in a database that contains XML and I'm trying to write a Python script to count instances of a particular node attribute.
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Reintegrate can only be used if revisions X through Y were previously merged from to reintegra
Been using SVN branches with Tortoise 1.6. I've been periodically merging the trunk into the branch to keep it up to date.
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Co-variant array conversion from x to y may cause run-time exception
I have a private readonly list of LinkLabel s ( IList<LinkLabel> ). I later add LinkLabel s to this list and add those labels to a FlowLayoutPanel like follows:
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Why doesn't print work in a lambda?
Why doesn't this work?
8 Answers
8
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Plotting time in Python with Matplotlib
I have an array of timestamps in the format (HH:MM:SS.mmmmmm) and another array of floating point numbers, each corresponding to a value in the timestamp array.
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