misbehaving of sort function, for looping the first and last rows not orienting to my expected results and well as specified indexes not corrects

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Eng. Fredius Magige 2017-4-13

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https://ww2.mathworks.cn/matlabcentral/answers/335235-misbehaving-of-sort-function-for-looping-the-first-and-last-rows-not-orienting-to-my-expected-resul

编辑： Stephen23 2017-4-21

Hi misbehaving of sort function, for looping the first and last rows not orienting to my expected results and well as specified indexes not corrects. Any assistance will be appreciated too. see the code:

>> a=[7 9 5 7; 1 5 8 9; 1 2 7 3;10 0 9 9]
[A B]=sort(a)
a =
     7     9     5     7
     1     5     8     9
     1     2     7     3
    10     0     9     9
A =
     1     0     5     3
     1     2     7     7
     7     5     8     9
    10     9     9     9
B =
     2     4     1     3
     3     3     3     1
     1     2     2     2
     4     1     4     4
>> [sizr sizc]=size(a);
aaa=zeros(sizr,sizc);
for i=1:4
if(A(B(i,3),3)>A(B(i,2),2)), aaa(B(i,3),:)=a(B(i,3),:), aA=A(B(i,3),3)
else, aaa(B(i,2),:)=a(B(i,2),:), aA=A(B(i,2),2)
end, end
aaa =
     0     0     0     0
     0     0     0     0
     0     0     0     0
    10     0     9     9
aA =     9
aaa =
     0     0     0     0
     0     0     0     0
     1     2     7     3
    10     0     9     9
aA =     8
aaa =
     0     0     0     0
     1     5     8     9
     1     2     7     3
    10     0     9     9
aA =     7
aaa =
     0     0     0     0
     1     5     8     9
     1     2     7     3
    10     0     9     9
aA =     9

6 个评论
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Rik 2017-4-13

So the problem is not with the output of sort? What is the goal of this code? You may be better off posting in your own language.

Roger Stafford 2017-4-13

在 MATLAB Online 中打开

As far as I can make out, you are expecting the sorting to occur along the rows, but the ‘sort’ function sorts along the columns unless you specify otherwise.

sort(a,1) sorts along each column
sort(a,2) sorts along each row
sort(a) by default sorts along each column

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Answer 1

Eng. Fredius Magige 2017-4-21

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https://ww2.mathworks.cn/matlabcentral/answers/335235-misbehaving-of-sort-function-for-looping-the-first-and-last-rows-not-orienting-to-my-expected-resul#answer_263860

编辑：Stephen23 2017-4-21

在 MATLAB Online 中打开

Hi all my collegues, I got best answer by manipulation of sort as:

[AA BB]=sort(Graptable(:,[12:21,1:11])); Graptable = Graptable (BB,[1:21]);
Graptable(2*JmRow+1:end,:)=[ ]; Graptable (:,22)= 0;
for ii=1:JmRow
if(Graptable(ii,12)~=0&&Graptable(ii,13)~=0), Graptable (ii,:)=0;
else, end, end
Graptable (JmRow+1:end,22)=Graptable(JmRow+1:end,12);
Graptable (1:JmRow,22)=Graptable(1:JmRow,13);
SOORTING1=sortrows(Graptable,[22,12]); SOORTING1(1:JmRow,:)=[];%SOORTING1(:,22)=[ ];