Help with displaying the vowels

Question

Caleb Steel 2017-10-10

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https://ww2.mathworks.cn/matlabcentral/answers/360652-help-with-displaying-the-vowels

评论： Rena Berman 2017-10-30

采纳的回答： Walter Roberson

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Hi, I want to make my code to be converted to switch and case statements and have the desired output from the picture:

function [vowels] = locateVowels( charactercell )
isvowel=@(s) ismember(lower(s),'aeiou');
isvowel=@(s) ismember(lower(s),'aeiou');
idxV=cellfun(isvowel,charactercell,'unif',0);
vowels=cellfun(@(s,i) lower(s(i)),charactercell,idxV,'unif',0);
end

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Rena Berman 2017-10-30

(Answers Dev) Restored edit

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Answer 1

Walter Roberson 2017-10-10

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Hint:

x(ismember(x, y))

However, it is tricky to determine what the vowels are in English. See https://www.mathworks.com/matlabcentral/answers/326767-finding-vowels-in-a-string-the-user-inputs-and-printing-the-vowels-here-s-the-problem#answer_256208

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Walter Roberson 2017-10-10

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vowels = 'aeiouàáâãäåæèéêìíîïòóôõöùúûüýāăąőűǻǽǿȺḯṍấắếớứ';
cellfun(@(s) vowels(ismember(vowels, lower(s))), test, 'uniform', 0)

The vowels list above is not complete; I got tired of going through the charts. Also, it is not impossible that some of those might have the shape of a vowel with a combining mark but might, in their respective language, not act as a vowel.

I did not attempt to sort the vowels alphabetically: they are sorted above by unicode position. For example in Polish, ą sorts immediately after a in the dictionary

Walter Roberson 2017-10-11

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The solution for in-order output of the vowels is:

vowels = 'aeiouàáâãäåæèéêìíîïòóôõöùúûüýāăąőűǻǽǿȺḯṍấắếớứ';
disp(cellfun(@(C) C(ismember(C,vowels)), lower(Test), 'uniform', 0))

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Answer 2

dpb 2017-10-10

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https://ww2.mathworks.cn/matlabcentral/answers/360652-help-with-displaying-the-vowels#answer_285143

编辑：dpb 2017-10-10

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Use the string a cell array processing features of Matlab..

test={'Opal','Otis';'Fib','Lupe'};
isvowel=@(s) ismember(lower(s),'aeiou');
idxV=cellfun(isvowel,test,'unif',0);
cellfun(@(s,i) lower(s(i)),test,idxV,'unif',0)
ans = 
  'oa'    'oi'
  'i'     'ue'

Presuming this is homework, I recommend you fully understand how it works and can reproduce it without coaching/help if asked to 'splain how you got the solution... :)

Hopefully will provide some ideas on how to more efficiently find the locations and you can then build your own solution based on those...or, if is real problem and not homework, you're more than welcome!! :)

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Walter Roberson 2017-10-10

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You cannot just disp() those things. disp() displays them in the command window. You need to store them, like

counter = 0;
switch cell{1:end,2}
  case 'a'
    counter = counter + 1;
    output(counter) = 'a';
  case 'e'
    counter = counter + 1;
    output(counter) = 'e';
end

Then once you have stored them all in the order you want, you can display the output.

Note: do not use "cell" as the name of a variable: you will intefere with the important function cell()

Note: you had the wrong syntax for switch.

Note: really, though, the line

cellfun(@(s,i) lower(s(i)),test,idxV,'unif',0)

is going to display the results anyhow, because you did not assign the result to a variable and you did not put a semi-colon on the end of the line to suppress the output.

Note: really, though, all you need to do is assign the output of that cellfun to a variable and disp() the variable. The default output when you just allow a value to be displayed is different than if you disp() the variable. dpb happens to be running an older version which naturally output in the way you would prefer.

Walter Roberson 2017-10-10

编辑：Walter Roberson 2017-10-10

在 MATLAB Online 中打开

Sigh.

function [vowels] = locateVowels( charactercell )
    vowels = '';
    vowelcount = 0;
    for row = 1 : length(charactercell)
      thisentry = charactercell{row, 2};
      switch thisentry
          case 'a'
              vowelcount = vowelcount + 1;
              vowels(vowelcount) = 'a';
          case 'ä'
              vowelcount = vowelcount + 1;
              vowels(vowelcount) = 'ä';
          case 'e'
              vowelcount = vowelcount + 1;
              vowels(vowelcount) = 'e';
          case 'ë'
              vowelcount = vowelcount + 1;
              vowels(vowelcount) = 'ë';
          case 'é'
              vowelcount = vowelcount + 1;
              vowels(vowelcount) = 'é';
          case 'i'
              vowelcount = vowelcount + 1;
              vowels(vowelcount) = 'i';
          case 'ï'
              vowelcount = vowelcount + 1;
              vowels(vowelcount) = 'ï';
          case 'o'
              vowelcount = vowelcount + 1;
              vowels(vowelcount) = 'o';
          case 'ö'
              vowelcount = vowelcount + 1;
              vowels(vowelcount) = 'ö';
          case 'u'
              vowelcount = vowelcount + 1;
              vowels(vowelcount) = 'u';
          case 'ü'
              vowelcount = vowelcount + 1;
              vowels(vowelcount) = 'ü';
      end
    end
end

Note: all of the above are used in English. https://en.wikipedia.org/wiki/English_terms_with_diacritical_marks

Walter Roberson 2017-10-11

在 MATLAB Online 中打开

function [vowels] = locateVowels( charactercell )
    vowels = cell(size(charactercell));
    for cell_idx = 1 : numel(charactercell)
      thesevowels = '';
      vowelcount = 0;
      thisentry = charactercell{cell_idx};
      for str_idx = 1 : length(thisentry)
        switch lower(thisentry(str_idx))
          case 'a'
              vowelcount = vowelcount + 1;
              thesevowels(vowelcount) = 'a';
          case 'ä'
              vowelcount = vowelcount + 1;
              thesevowels(vowelcount) = 'ä';
          case 'e'
              vowelcount = vowelcount + 1;
              thesevowels(vowelcount) = 'e';
          case 'ë'
              vowelcount = vowelcount + 1;
              thesevowels(vowelcount) = 'ë';
          case 'é'
              vowelcount = vowelcount + 1;
              thesevowels(vowelcount) = 'é';
          case 'i'
              vowelcount = vowelcount + 1;
              thesevowels(vowelcount) = 'i';
          case 'ï'
              vowelcount = vowelcount + 1;
              thesevowels(vowelcount) = 'ï';
          case 'o'
              vowelcount = vowelcount + 1;
              thesevowels(vowelcount) = 'o';
          case 'ö'
              vowelcount = vowelcount + 1;
              thesevowels(vowelcount) = 'ö';
          case 'u'
              vowelcount = vowelcount + 1;
              thesevowels(vowelcount) = 'u';
          case 'ü'
              vowelcount = vowelcount + 1;
              thesevowels(vowelcount) = 'ü';
        end
      end
      vowels{cell_idx} = thesevowels;
    end
end

This is an approach I would never take, and is suitable only for an exercise in proving that one knows how to use the switch construct and cell arrays.

Caleb Steel 2017-10-11

Thank you so much!

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Help with displaying the vowels

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Help with displaying the vowels

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