How to sort a matrix using loops?

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Michael Porter
Michael Porter am 16 Apr. 2016
Bearbeitet: John BG am 24 Apr. 2016
I need to sort a matrix from least to greatest without the sort function. It needs to be done in nested loops. For example, I need to take the matrix [9 5;7 4;8 6] and sort it into [4 5;6 7;8 9].
  1 Kommentar
Roger Stafford
Roger Stafford am 17 Apr. 2016
See this site for a variety of possible algorithms you might use:
https://en.wikipedia.org/wiki/Sorting_algorithm

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Antworten (1)

John BG
John BG am 17 Apr. 2016
Bearbeitet: John BG am 17 Apr. 2016
Michael
1 for loop is enough
A=randi([-10 10],5,6) % generate input
B=A(:)' % reshape A into straight line
L=length(B)
C=[]
for k=1:L
v=find(B==max(B)) % in case repeated values
C=[C B(v(1))]
B(v(1))=[]
end
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thanks in advance
John
  2 Kommentare
Jan
Jan am 17 Apr. 2016
The missing pre-allocation is a bad programming style.
John BG
John BG am 17 Apr. 2016
Bearbeitet: John BG am 24 Apr. 2016
Actually, you are right, there are other ways to build the variable collecting the result, some good habits die hard, like declaring variables before using them.
The 'bad' you mention, why? Because it's going to size some more bytes disk?

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