How Can i write a function that takes a structure array and returns this array with bubble sorting

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I want to write a function that takes a structure array holding information about students(name,age,gpa etc.) and returns this array by ordering the students with respect to their age by bubble sort.
function a=structarray (age,a)
for i=1:length(a)-1
if a(i).(age)>a(i+1).(age)
T=a(i);
a(i)=a(i+1);
a(i+1)=T;
i write this. but of course it is not working.pls guys help me.
  4 commentaires
Walter Roberson
Walter Roberson le 26 Nov 2019
When you call the function, passing in that a as the second parameter, what would you pass in as the first parameter?
What difficulties are you observing with your code?
Dart Min
Dart Min le 26 Nov 2019
I can't call the function. I don't know what should i put in argument side. So i think the header section is wrong. when i write "function a=structarray(a)" is also not working.

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Réponse acceptée

Walter Roberson
Walter Roberson le 26 Nov 2019
function a=structarray(a)
for i=1:length(a)-1
if a(i).age > a(i+1).age
T=a(i);
a(i)=a(i+1);
a(i+1)=T;
end
end
  4 commentaires
Dart Min
Dart Min le 27 Nov 2019
thanks a lot. but now only a(3) and a(4) changed. Then function stopped.
Walter Roberson
Walter Roberson le 27 Nov 2019
That is because your bubble sort algorithm needs more work.
You only make a single pass through the data. But suppose the least age was in the last entry. Your code would exchange that with the second last entry, but would not then proceed to "bubble" that lowest age from the second last entry all the way back to the first entry.

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Plus de réponses (1)

Stijn Haenen
Stijn Haenen le 26 Nov 2019
Maybe this will work:
ages=[structurearray.age];
[a,b]=sort(ages);
newstructurearray=structurearray(b);
The used structure is attached.
  3 commentaires
Stijn Haenen
Stijn Haenen le 26 Nov 2019
Ah i missed that,
maybe this:
a(1).name='Matt';
a(1).age=22;
a(1).gpa=77;
a(2).name='Chris';
a(2).age=23;
a(2).gpa=45;
a(3).name='Park';
a(3).age=26;
a(3).gpa=81;
a(4).name='Stewie';
a(4).age=19;
a(4).gpa=44;
ages=[a.age];
[b]=unique(ages);
new_a=[];
for i=1:numel(b)
num=(ages==b(i));
new_a=[new_a;a(num)];
end
Walter Roberson
Walter Roberson le 27 Nov 2019
That just pushes the sorting off into unique() but the assignment requirement is to use bubble sort.

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