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Plot two graphs in same plot in R
...() will detect this and in turn use plot.function() to plot your function (read up on multiple dispatch to learn more about this). However, lines.function() is not defined, so lines() doesn't know what to do with a parameter of class function. lines can only deal with your data and time series objec...
What are some compelling use cases for dependent method types?
... shortestPath(g: Graph)(n1: g.Node, n2: g.Node) = ...
Of course, this already worked if defined inside Graph, but say we can't modify Graph and are writing a "pimp my library" extension for it.
About the second question: types enabled by this feature are far weaker than complete dependent types ...
How to create and write to a txt file using VBA
....WriteLine("Enter Text")
Console.WriteLine("")
SaveVar = Console.ReadLine
My.Computer.FileSystem.WriteAllText("N:\A-Level Computing\2017!\PPE\SaveFile\SaveData.txt", "Text: " & SaveVar & ", ", True)
Console.WriteLine("")
Console.WriteLine("File Saved")
Console.W...
How to loop through files matching wildcard in batch file
...le letter - cryptic error messages will appear if you try to use something readable and meaningful.
– Bruce Dawson
Jan 29 '17 at 5:39
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Check existence of directory and create if doesn't exist
...le.path(mainDir, subDir))
dir.create() does not crash if the directory already exists, it just prints out a warning. So if you can live with seeing warnings, there is no problem with just doing this:
dir.create(file.path(mainDir, subDir))
setwd(file.path(mainDir, subDir))
...
CSS Selector that applies to elements with two classes
...till have to deal with ancient browsers like IE6, be aware that it doesn't read chained class selectors correctly: it'll only read the last class selector (.bar in this case) instead, regardless of what other classes you list.
To illustrate how other browsers and IE6 interpret this, consider this C...
Rails: Using greater than/less than with a where statement
...the number extracted into a well named constant this may be the easiest to read and understand at a glance.
Inverted logic
We can use the fact that x > y == !(x <= y) and use the where not chain.
User.where.not(id: -Float::INFINITY..200)
which generates the SQL
SELECT `users`.* FROM `use...
Command line progress bar in Java
...T
Simple console progress bar. Progress bar writing now runs on another thread.
Menlo, Fira Mono, Source Code Pro or SF Mono are recommended for optimal visual effects.
For Consolas or Andale Mono fonts, use ProgressBarStyle.ASCII (see below) because the box-drawing glyphs are not aligned prope...
Visual Studio 2013 doesn't discover unit tests
...our solution is in a protected drive that you need administrator access to read/write, sometimes only a portion of the tests come up. Definitely run VS as administrator in that case.
If your solution is 64 bit, make sure that Test > Test Settings > Default Processor Architecture is set to x64....
Implications of foldr vs. foldl (or foldl')
Firstly, Real World Haskell , which I am reading, says to never use foldl and instead use foldl' . So I trust it.
7 A...