# Sort array elements in ascending order

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Pankaja Tanjore il 18 Feb 2015
Modificato: Stephen23 il 19 Feb 2015
Hello,
I have an input array which i want to sort column elements in ascending order
i =
[4 35;
2 4;
2 6 ;
1 9;
4 3 ;
4 6 ;
1 16;
3 17];
and get the sorted output array in the following manner
res=
[1 9;
1 16;
2 4;
2 6;
3 17;
4 3;
4 6;
4 35];
First sort according to the 1st column(ascending order),if the first column is same then check for the second column ,then sort in the acending order based on the second value.
For example : I have 1 as the least value in the first column and have two entries for 1. So check for the second element for 1. I have 9 and 16 as the second element for 1 respectively.Now sort these second elemnts in ascending order.so i have the output as [1 9; 1 16] .
Similary for all the other elements of the matrix.
Please let me know the MATLAB function for sorting the array elements and get me the required output as mentioned above.
Looking forward to hear from you
Thanks Pankaja
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### Risposta accettata

Stephen23 il 18 Feb 2015
Modificato: Stephen23 il 18 Feb 2015
You can sort the rows and extract the minimum value of each "group" like this:
>> A = [8 4; 3 6; 2 7; 1 4; 2 3;2 1;3 1; 3 5; 8 6; 8 1];
>> B = sortrows(A);
>> X = [true;diff(B(:,1))>0];
>> B(X,:)
ans =
1 4
2 1
3 1
8 1
Where each row is the "minimum" of each group.
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Stephen23 il 19 Feb 2015
Modificato: Stephen23 il 19 Feb 2015
If you define exactly what the "difference" between two differently-dimensioned matrices is, then I will show you how to code it.
Your matrices have a different number of rows: what are we supposed to subtract the un-matched row from? Lets look at your matrices in detail:
A - B = C
[1 4; [1 6; = [0 -2;
2 1; 2 1; 0 0;
3 1; 2 5; 1 -4;
8 1] 3 0; 5 1;
8 1] <- what are we supposed to subtract this from?

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### Più risposte (1)

Ilham Hardy il 18 Feb 2015
res = sortrows(i,[1,2]);
PS: Don't name you variable i, by the way.
i in matlab represent sqrt(-1)
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Pankaja Tanjore il 18 Feb 2015
Hello , Thanks for the reply. As suggested by you i used the function sortrows() and I am getting the correct output. I tested the function with the following input data.
Input_Arr=[8 4; 3 6; 2 7; 1 4; 2 3;2 1;3 1; 3 5; 8 6; 8 1];
i am getting the following output Output_Arr=[1 4; 2 1; 2 3; 2 7; 3 1; 3 5 ;3 6; 8 1; 8 4; 8 6];
From this output now i want extract the minimum row data for each column
for example: In the above output array i have [2 1; 2 3; 2 7] for the second row. Now from this i want to extract only [2 1] as that is the minimum of the three.
So please let me know the function in MATLAB to extract this.
Looking forward to hear from you. Thanks Pankaja

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