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Bug introduced in 10.2 and fixed in 10.3


The new function Alphabet introduced in Mathematica 10.2 gives the wrong list of letters for the Spanish language in my system (Windows 7 64 bits).

Alphabet[Entity["Language", "Spanish"]]
{"a", "b", "c", "d", "e", "f", "g", "h", "i", "l", "m", "n", "ñ", "o", "p", "q", "r", "s", "t", "u", "v", "z"}

That list is missing {"j", "k", "w", "x", "y"} and special characters.

The list provided by LanguageData its also wrong

LanguageData["Spanish", "Letters"]
{"a", "á", "b", "c", "d", "e", "é", "f", "g", "h", "i", "í", "j", "l", "m", "n", "ñ", "o", "ó", "p", "q", "r", "s", "t", "u", "ú", "ü", "v", "x", "y", "z"}

as its missing {"k","w"}.

Can anybody reproduce this behaviour in other systems and other languages?

I have filed a report with Wolfram Technical Support [CASE:3388733]

The correct list as given by the Spanish Royal Academy of Language is

a, b, c, d, e, f, g, h, i, j, k, l, m, n, ñ, o, p, q, r, s, t, u, v, w, x, y, z.

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    $\begingroup$ I'm in the process of installing 10.2 presently, but in 10.1, LanguageData["Spanish", "Letters"] produces the same result you get, which is missing k and w $\endgroup$ – Michael Witt Jul 20 '15 at 17:18
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    $\begingroup$ I get this in 10.2 too, so I will be adding the "bugs" tag, as we have sufficient confirmation this is a bug. $\endgroup$ – Sjoerd C. de Vries Jul 20 '15 at 18:50
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    $\begingroup$ It's a bug, and it's being looked into. $\endgroup$ – Stefan R Jul 20 '15 at 21:53
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    $\begingroup$ You can use LanguageData["Spanish", "BasicAlphabet"] while it gets fixed. $\endgroup$ – FJRA Jul 20 '15 at 22:06
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Just an extended comment:

The problem seems not to be fixed in v11.1.1 for other "latin" alphabet based languages. Here are some differences between what is returned by Alphabet and LanguageData[lang, "Letters"] for some european countries.

Alphabet seems to do OK, but the problem is that "Letters" do not always include at least all characters returned by Alphabet (below in red).

({#, Grid@
   List@(SequenceAlignment @@ 
      StringJoin /@ 
       Sort /@ {Alphabet[#], 
         LanguageData[#, "Letters"]})} & /@ {"Czech", "Danish", 
 "Dutch", "Finnish", "French", "German", "Hungarian", "Italian", 
 "Polish", "Portuguese", "Romanian", "Slovak", "Slovenian", 
 "Spanish", "Swedish"} // Grid[#, Frame -> All] &) /. {expr : {_, ""} :> Style[expr, Red, Bold], expr : {"", _} :> Style[expr, Blue, Bold]}

enter image description here

For example, here is what is returned for "Danish":

Sort /@ {Alphabet[#], LanguageData[#, "Letters"]} &@"Danish" // Column

Blockquote

where you can see "q","w","x","z" are not returned by LanguageData as indicated in red in the table above.

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    $\begingroup$ Have you reported this? $\endgroup$ – Alexey Popkov Aug 3 '17 at 14:19
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    $\begingroup$ @AlexeyPopkov No, never done that. Please do so if you can. By the way, the problem with the missing letters is that this propagates to other LanguageData properties like "LetterFrequency" where these letters are also missing... $\endgroup$ – SquareOne Aug 3 '17 at 14:31
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This was reported to Wolfram Technical Support [CASE:3388733] and acknowledged as a bug.

The problem was fixed in Mathematica 10.3.

Alphabet[Entity["Language", "Spanish"]]
{"a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n", "ñ", "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z"}
LanguageData["Spanish", "Letters"]
{"a", "á", "b", "c", "d", "e", "é", "f", "g", "h", "i", "í", "j", "k", "l", "m", "n", "ñ", "o", "ó", "p", "q", "r", "s", "t", "u", "ú", "ü", "v", "w", "x", "y", "z"}
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