MAXIMUM MATRIKS IN MATLAB

i have a matrix A

A = [[ 0, 0, 0, 99, 61, 0,0 ],

[ 2, 0, 0, 89, 61, 0,0 ]

[0, 0, 0, 0, 0, 89, 0 ],

[12, 0, 0, 0, 0, 0, 0 ]

[0, 0, 0, 0, 0, 0, 0 ]].

how to determine the maximum value of each row in the matrix and make other values that are not maximum to 0. for example:

A = [[ 0, 0, 0, 99, 0, 0 ,0 ],

[ 0, 0, 0, 89, 0, 0, 0 ]

[0, 0, 0, 0, 0, 89, 0 ],

[12, 0, 0, 0, 0, 0, 0 ]

[0, 0, 0, 0, 0, 0, 0 ]].

Thank you

[John D'Errico]

What if there are multiple values which are identical. Which one do you choose to leave non-zero? The first, the last, ALL of them?

[jane]

the selected value is the largest value

[Torsten]

@jane

Which matrix do you want if

A = [3 5 5 ; 6 6 6 ; 7 2 9]

[John D'Errico]

NO. You do not understand my question. Suppose one row happens to have the elements: [0 0 0 0 100 98 100 3 0 0].

TWO of those elements are 100, the maximum. What would be the desired behavior?

Answer 1

[John D'Errico]

Since you did not say which one to leave non-zero, I'll asssume that all values equal to the maximum are retained.

A = randi(20,[10,5])

A = 10×5

12 15 7 1 7 11 17 15 8 14 4 1 17 19 6 11 9 3 9 9 16 20 15 14 7 12 16 11 14 12 3 19 6 17 2 17 8 7 9 2 11 6 18 11 5 8 15 12 7 20

A(A < max(A,[],2)) = 0

A = 10×5

0 15 0 0 0 0 17 0 0 0 0 0 0 19 0 11 0 0 0 0 0 20 0 0 0 0 16 0 0 0 0 19 0 0 0 17 0 0 0 0 0 0 18 0 0 0 0 0 0 20

The above code will run on R2016b or later. If two elements in a row are the same and the max in that row, it will retain them all.

If the maximum element in a row was zero, then the entire row will be zero.

[jane]

Thanks John