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Warning message: In `…` : invalid factor level, NA generated
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@David Why does R convert it into Factor?
– KannarKK
Aug 2 '15 at 10:00
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A generic list of anonymous class
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It does seem an inconsistency in Visual Studio, that intellisense isn't more helpful in uncovering missing includes of assemblies with referenced extension methods (same as referenced types).
– LOAS
Jan 4 '12 at 12:21
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How to enumerate an enum with String type?
...ase diamonds = "♦"; case clubs = "♣" }
Then the following code will print all possible values:
Suit.allCases.forEach {
print($0.rawValue)
}
Compatibility with earlier Swift versions (3.x and 4.x)
If you need to support Swift 3.x or 4.0, you may mimic the Swift 4.2 implementation by adding...
How to remove from a map while iterating it?
...nalogy, it has always been perfectly legitimate to delete p where p is a pointer-to-constant. Constness does not constrain lifetime; const values in C++ can still stop existing.
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How to use SharedPreferences in Android to store, fetch and edit values [closed]
...nces gives me the following error: The method getSharedPreferences(String, int) is undefined for the type MyActivity
– Si8
Jul 29 '13 at 19:14
17
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How do I find which program is using port 80 in Windows? [duplicate]
... = $g[2].Value } -PassThru |
Add-Member @{ LocalPort = [int]$g[3].Value } -PassThru |
Add-Member @{ RemoteAddress = $g[4].Value } -PassThru |
Add-Member @{ RemotePort = $g[5].Value } -PassThru |
Add-Member @{ State = $g[6].Value...
Programmer Puzzle: Encoding a chess board state throughout a game
...ves”. The problem also says nothing about knowing the moves up to this point. That’s actually a problem as I’ll explain.
Castling
The game has proceeded as follows:
e4 e5
Nf3 Nc6
Bb5 a6
Ba4 Bc5
The board looks as follows:
White has the option of castling. Part of the requirements f...
Selecting with complex criteria from pandas.DataFrame
...tup:
>>> import pandas as pd
>>> from random import randint
>>> df = pd.DataFrame({'A': [randint(1, 9) for x in range(10)],
'B': [randint(1, 9)*10 for x in range(10)],
'C': [randint(1, 9)*100 for x in range(10)]})
>>> df
A...
How to determine if binary tree is balanced?
... abs(Height(tree.left) - Height(tree.right)) <= 1)
Translating that into the programming language of your choice should be trivial.
Bonus exercise: this naive code sketch traverses the tree far too many times when computing the heights. Can you make it more efficient?
Super bonus exercise: ...
get keys of json-object in JavaScript [duplicate]
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I am trying to convert rows from DB to JSON. I am getting numerical index along with actual column names as keys. Why I am getting numerical index?
– Nguai al
Jul 24 at 16:41
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