List of maximum number in the matrix

Hi everyone,

Suppose I have a matrix:

a = [3;1;4;2;3;4;1;4;3;1;2;4];

Then I want matrix b to be:

b = [3;6;8;12]

• Matrix b is included the rwo number of all max number in the matrix a, e.g. row(3)=4; row(6)=4; row(8)=4; row(12)=4;

Can anyone please help me?

Answer 1

[Azzi Abdelmalek]

a = [3;1;4;2;3;4;1;4;3;1;2;4];
idx=find(ismember(a,max(a)))

Answer 2

[Star Strider]

Use the find function:

a = [3;1;4;2;3;4;1;4;3;1;2;4];

b = find(a == max(a))

yields:

b =

       3
       6
       8
      12