CODEWITHSUNDEEP
matlabmax
Simplicity
Simplicity

Reputation: 48986

Assiging the maximum value of a column to the row

Say we have the following matrix

1 3 6
5 4 7
5 3 9

What I'm trying to do is for each row, I assign it the maximum value of the column. So, for instance, I'm expecting the following output:

x(1) = 6
x(2) = 7
x(3) = 9

I tried doing that using by writing the code below, but didn't get the expected putput:

x=[1 3 6;5 4 7; 5 3 9]
[rows, columns] = size(x);
for i=1:columns
    for j=1:rows
        [maximum, position] = max(x(j,:));
        disp('MAXIMUM')
        x(j)=maximum
    end
end

What should I do to get the expected output?

Upvotes: 1

Views: 75

Answers (2)

Marc Claesen
Marc Claesen

Reputation: 17036

You can use the built-in max function with a dimension specifier: max(x,[],dim).

In your case, assuming your matrix is called A:

>> x=max(A,[],2)
ans =

     6
     7
     9

Upvotes: 3

Acorbe
Acorbe

Reputation: 8391

If I understood correctly your question, you can just use the max function. It naturally operates on columns, therfore, some transposition is necessary.

x=[1 3 6;5 4 7; 5 3 9]

y = max(x')'

y =

   6
   7
   9

You can even reassing the values on the fly

x = max(x')'.

Upvotes: 2

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