Alphabetical Sorting (case insensitive)

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Aiden Chrisan
Aiden Chrisan 2018-4-19
评论： Walter Roberson 2025-2-21

Heyy everyone, Having small issue with my code, where i want to assort an array of words in alphabetical order (with specific case insensitive sorting). My code is;

A = ["help" ; "MATLAB" ; "anyTIME" ; "matrix" ; "alGEBra"];
[M,N]=size(A);
for i = 2:N
    char = A(i,:);
    j = i-1;

      A_j=A(j+1,:);
      A(n+1:i)=A_j(A_j>char);
      j=j-max(A_th);
      A(j+1,:) = char;
end
disp(A);

it assorts the words, but not correctly. I can successfully do this sorting with numbers no problem. And i can sort the words alphabetically with the output case sensitive(have a couple different codes but wont attach them coz i dont want to bore you lovely people). but getting the output as alphabetical AND case insensitive is proving much more problematic (NOTE: i know you could use the sort function, but i want to do it with this one for loop). Any help is much appreciated <3

  1 个评论
Stephen23
Stephen23 2018-4-19
编辑：Stephen23 2018-4-19
The first line
A = ["help" ; "MATLAB" ; "anyTIME" ; "matrix" ; "alGEBra"];
defines a 5x1 string array. Then you measure the size of that string array using
[M,N]=size(A);
So given that N==1, I don't see how this for loop will ever iterate even once:
for i = 2:N
Also, if A is really a string array, then char = A(i,:); is not a char vector but another string array.

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回答（2 个）

Suraj Mankulangara
Suraj Mankulangara 2018-4-23
Hello Aiden,
Here's a simple (and likely not very efficient) bubblesort implementation of case-insensitive string array sorting:
A = ["help" ; "MATLAB" ; "anyTIME" ; "matrix" ; "alGEBra"];
[M,N]=size(A);
for i = 1:M-1
for j = 1:M-1
curr = A(j);
next = A(j+1);
if upper(curr) > upper(next)
A(j) = next;
A(j+1) = curr;
end
end
end
disp(A);
I do not quite understand why you do not want to use the in-built MATLAB "sort" function to achieve this. There is no need to reinvent the wheel. Also, the in-built functions are likely to be much more efficient and optimized. You could do case-insensitive sorting using the "sort" function by converting all characters to uppercase, like this:
[~,idx]=sort(upper(A))
out=A(idx)
Adam Danz
Adam Danz 2025-2-20
Ran in:
> I want to assort an array of words in alphabetical order with case insensitive sorting
A = ["help" ; "MATLAB" ; "anyTIME" ; "matrix" ; "alGEBra"];
[~,sortIdx] = sort(lower(A));
ASort = A(sortIdx)
ASort = 5x1 string array
"alGEBra" "anyTIME" "help" "MATLAB" "matrix"
  1 个评论
Walter Roberson
Walter Roberson 2025-2-21
I experimented with using the ComparisonMethod option to sort(), but it is not recognized for the case of sorting strings.

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