How to pick the lowest element for each row by different matrices?

Hi everyone,

I have the following three matrices (5x2)

a = [41 53; 3 20; 10 40; 11 50; 55.6 111]
b = [19 27.2; 31 10; 2.1 99; 70 55; 7 23]
c = [1 34; 41 10; 11 31; 5 39; 10 22]

I'm looking for the code to create a matrix D (5x2), such that each row is picked by a, b, c with the lowest item in the first column for each row, namely I would like to obtain:

D = [1 34; 3 20; 2.1 99; 5 39; 7 23]

Answer 1

[KALYAN ACHARJYA]

I'm looking for the code to create a matrix D (4x2), such that each row is picked by a, b, c with the lowest item in the first column for each row, namely I would like to obtain:

It might be 3x2 Martix in the given example?

a=
    3        20
b=
   2.1       99
c=
   1         34

One way:

idx_a=find(a(:,1)==min(a(:,1)));
idx_b=find(b(:,1)==min(b(:,1)));
idx_c=find(c(:,1)==min(c(:,1)));
D=[a(idx_a,:);b(idx_b,:);c(idx_c,:)]

D =

 3           20
 2.1         99
 1           34

[Diego Rago]

Thank you Sir for the feedback!

I'm sorry because I think I have not explained it very clearly. Basically, I want to compare first row of matrix a, with first row of matrix b and first row of matrix c and pick the one with the lowest item for the first column (thus [1 34]), and doing the same thing for the the remaining rows, getting eventually five rows in D.

[KALYAN ACHARJYA]

data=cat(3,a,b,c);
colm1=min(data(:,1,:),[],3);

colm1 =

            1
            3
          2.1
            5
            7

Get the indices of the corresponding colm1 data, extract the same from the data (column 2). Later I will try on it and provide you the complete answer.

[Diego Rago]

Thank you a lot, it works perfectly!