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Arrays vs Vectors: Introductory Similarities and Differences [closed]
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arrays:
are a builtin language construct;
come almost unmodified from C89;
provide just a contiguous, indexable sequence of elements; no bells and whistles;
are of fixed size; you can't resize an array in C++ (unless it's an array of POD and it's allocated with malloc);
their size must be ...
Ruby on Rails - Import Data from a CSV file
I would like to import data from a CSV file into an existing database table. I do not want to save the CSV file, just take the data from it and put it into the existing table. I am using Ruby 1.9.2 and Rails 3.
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What algorithm does Readability use for extracting text from URLs?
... been trying to find a way of intelligently extracting the "relevant" text from a URL by eliminating the text related to ads and all the other clutter.After several months of researching, I gave it up as a problem that cannot be accurately determined. (I've tried different ways but none were reliabl...
Among $_REQUEST, $_GET and $_POST which one is the fastest?
...enerally speaking :
You should use $_GET when someone is requesting data from your application.
And you should use $_POST when someone is pushing (inserting or updating ; or deleting) data to your application.
Either way, there will not be much of a difference about performances : the difference...
Add text to Existing PDF using Python
... with canvas>
can.save()
packet.seek(0)
input = PdfFileReader(packet)
From here you can merge the pages of the input file with another document.
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Generate Java class from JSON?
In a Java Maven project, how do you generate java source files from JSON? For example we have
13 Answers
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The type or namespace name does not exist in the namespace 'System.Web.Mvc'
...rojects that spontaneously uninstalled asp.net MVC somehow. I installed it from Nuget and now they both work again. This happened after a recent batch of windows updates that included .net framework updates for the version I was using (4.5.1).
Edit: From the .Net Web Development and Tools Blog:
Mi...
Get difference between two lists
...fo objects I was using set subtraction. To exclude certain tarinfo objects from being extracted from the archive. Creating the new list was fast but super slow during extraction. The reason evaded me at first. Turns out reordering the tarinfo objects list caused a huge performance penalty. Switching...
How can I force division to be floating point? Division keeps rounding down to 0?
...n Python 3, it produces a float. We can get the new behaviour by importing from __future__.
>>> from __future__ import division
>>> a = 4
>>> b = 6
>>> c = a / b
>>> c
0.66666666666666663
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What does “coalgebra” mean in the context of programming?
....)
This lets us talk about algebras as a type τ with a single function from some mess of Eithers to a single τ. For monoids, this mess is: Either (τ, τ) (); for groups (which have an extra τ → τ operation), it's: Either (Either (τ, τ) τ) (). It's a different type for every different stru...