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Memoization in Haskell?
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We can do this very efficiently by making a structure that we can index in sub-linear time.
But first,
{-# LANGUAGE BangPatterns #-}
import Data.Function (fix)
Let's define f, but make it use 'open recursion' rather than call itself directly.
f :: (In...
Moving project to another folder in Eclipse
...rer Tab might still be the ones contained in the old_dir (you can check it by right clicking each and following through: "Resource -> Linked Resource" to see the Path Variables values). Thus, they have to be removed from this work space. Delete the Nios 2 Application Project and the BSP Project f...
How to convert java.util.Date to java.sql.Date?
...date-time classes bundled with early versions of Java have been supplanted by the new java.time package. See Oracle Tutorial. Much of the functionality has been back-ported to Java 6 & 7 in ThreeTen-Backport and further adapted to Android in ThreeTenABP.
A SQL data type DATE is meant to be date-...
Can I create more than one repository for github pages?
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You can have one site published to https://<username>.github.io by publishing to the master branch of a repository named “username.github.io” (substituting your actual username).
You can also have an additional site per GitHub project published to https://<username>.github.io/&...
d3 axis labeling
...'t built-in to D3's axis component, but you can add labels yourself simply by adding an SVG text element. A good example of this is my recreation of Gapminder’s animated bubble chart, The Wealth & Health of Nations. The x-axis label looks like this:
svg.append("text")
.attr("class", "x la...
How to achieve code folding effects in Emacs?
...support imenu. M-ximenu will let you jump to a function definition (etc.) by name. You can also bind it to a mouse click to get a menu of functions (or add it to the menubar; see the Info page for more detail). It provides data for which-function-mode, which will let you see which function you ar...
How can I loop through a C++ map of maps?
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@TannerSummers because accessing by value would add the inefficiency of copying each element; additionally if you wanted to modify the contents, you'd need to access the elements by references (or pointers) rather than by value.
– Riot
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Multiple columns index when using the declarative ORM extension of sqlalchemy
...ns/declarative/… "Keyword arguments can be specified with the above form by specifying the last argument as a dictionary"
– zzzeek
Oct 23 '17 at 16:18
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How to count the number of occurrences of an element in a List
...<String, Long> counts =
list.stream().collect(Collectors.groupingBy(e -> e, Collectors.counting()));
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Difference between Select and ConvertAll in C#
...on all IEnumerable<T> objects whereas ConvertAll is implemented only by List<T>. The ConvertAll method exists since .NET 2.0 whereas LINQ was introduced with 3.5.
You should favor Select over ConvertAll as it works for any kind of list, but they do the same basically.
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