Array consists of words of different languages. I need to sort elements in reverse alphabetical order and make a list of elements, which consist of english letters.

Example of array which consist of english and russian words:

m = {"computer", "экзамен", "elephant", "стол", "bread", "телефон", 
   "exception", "desktop", "best", "колонка", "zoom", "saphire", 

Sorting with Reverse@Sort[m] and Sort[m] work with english words only.

Select[m, LetterQ] can make a list of english words.

Problem is a different language (Russian in this e.g.)

  • $\begingroup$ I don't understand this question. Would you please give the output that you require for this sample input? $\endgroup$ – Mr.Wizard Jan 17 '14 at 12:37
  • $\begingroup$ output 1 = {"zoom", "saphire", "exception", "elephant", "desktop", "computer", "bread", "best", "ярость", "экзамен", "телефон", "стол", "колонка"} (reverse alphabetical order) output 2 = {"computer", "elephant", "bread", "exception", "desktop", "best", "zoom", "saphire"} (only english words) $\endgroup$ – Bakkkss Jan 17 '14 at 12:54
  • $\begingroup$ Yes, sorted in reverse alphabetical order $\endgroup$ – Bakkkss Jan 17 '14 at 13:11
m = {"computer", "экзамен", "elephant", "стол", "bread", "телефон", "exception",
     "desktop", "best", "колонка", "zoom", "saphire", "ярость"};

First Sort it:

sortedm = SortBy[m, First@ToCharacterCode@# &]
{"best", "bread", "computer", "desktop", "elephant", "exception", "saphire", "zoom",
 "колонка", "стол", "телефон", "экзамен", "ярость"}

Then Split it:

splittedm = {englishWords, russianWords} = SplitBy[sortedm, 
 First@ToCharacterCode@"А" <= (First@ToCharacterCode@#) <= First@ToCharacterCode@"я" &]
{{"best", "bread", "computer", "desktop", "elephant", "exception", "saphire", "zoom"}, 
 {"колонка", "стол", "телефон", "экзамен", "ярость"}}

which can be Reversed & Flattened:

Flatten[Reverse /@ splittedm]
{"zoom", "saphire", "exception", "elephant", "desktop", "computer", "bread", "best",
 "ярость", "экзамен", "телефон", "стол", "колонка"}

giving the desired Output 1.

As you wished you can also extract the English/Russian words (even if they are sorted):

{"best", "bread", "computer", "desktop", "elephant", "exception", "saphire", "zoom"}

To have the unsorted words use:

{unsortedEnglishWords, unsortedRussianWords} = GatherBy[m, 
 First@ToCharacterCode@"А" <= (First@ToCharacterCode@#) <= First@ToCharacterCode@"я" &]

giving the desired Output 2.


The ToCharacterCode@"А" and ToCharacterCode@"я" were taken from the Cyrillic script in Unicode Wiki page assuming that you are using the Basic Cyrillic alphabet.

"А" can be obtained with ToString@\:0410 and "я" with ToString@\:044F. Both letters are meant to be first and last elements of the Basic Cyrillic alphabet.

Other alphabets can be used in the same way.

  • 1
    $\begingroup$ +1 for detailed yet concise answer. $\endgroup$ – ciao Jan 17 '14 at 23:19

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