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

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Diego Rago on 15 Mar 2021
Commented: Diego Rago on 15 Mar 2021
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]

KALYAN ACHARJYA on 15 Mar 2021
Edited: KALYAN ACHARJYA on 15 Mar 2021
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 on 15 Mar 2021
Thank you a lot, it works perfectly!