how can I create a vector with unknown length?

I need to create a user defined function that recieves a vector x of any length and than sorts the vector from the largest to the smallest into a new vector y. I'm not allowed to use the function sort. I have no idea how to begin! please help me!! thank u!!!

Answer 1

[Roger Stafford]

This article should be of help to you.

 https://en.wikipedia.org/wiki/Sorting_algorithm

I tend to prefer the merge sort algorithm.

Answer 2

[John Doe]

The most intuitive (and simple to implement) is probably bubble sort:

https://en.wikipedia.org/wiki/Bubble_sort

Since this is an assignment, I'll leave some of it open, so fill in the blanks =)

n=length(A);

for j=1:1:n-1
    % comparing each number with the next and swapping
    for i=1:1:n-1
       if ...
      % In here you should check if A(i) > A(i+1)
      % If so, switch places. You need a temporary
      % variable, in order to not overwrite something.
       end
    end
end

Good luck =)

Answer 3

[Sean de Wolski]

xsorted = sortrows(x(:),-1)