Info
La pregunta está cerrada. Vuélvala a abrir para editarla o responderla.
Identifying and modifying the maximum in a matrix.
2 visualizaciones (últimos 30 días)
Mostrar comentarios más antiguos
I have a 100 by 200 matrix of random numbers. I want to identify the max number in each row and set it to 1, while setting everything else equal to 0.
Im able to identify the max, but currently unable to set up the for loop to modify the matrix.
Is anyone able to help?
0 comentarios
Respuestas (2)
KSSV
el 6 de Jun. de 2018
A = rand(100,200) ;
iwant = zeros(size(A)) ;
[m,n] = size(A) ;
for i = 1:m
[val,idx] = max(A(i,:)) ;
iwant(i,idx) = 1 ;
end
0 comentarios
Stephen23
el 6 de Jun. de 2018
Editada: Stephen23
el 6 de Jun. de 2018
This is MATLAB, so no loops are required for this task. It is easy in just one line:
>> M = randi(9,10,20) % fake data
M =
3 6 7 2 2 2 6 2 2 5 6 6 6 7 2 4 7 4 4 4
9 1 5 7 8 5 7 4 5 9 8 6 6 1 6 5 7 2 5 4
4 1 1 7 3 7 6 6 4 7 2 3 3 3 9 8 1 5 1 8
5 2 1 6 9 9 3 6 4 7 3 6 7 2 8 3 4 9 3 3
7 2 2 8 1 6 9 4 9 1 5 4 2 2 8 7 8 2 7 9
2 8 5 9 6 5 7 5 1 8 5 2 1 2 2 1 3 5 9 9
2 2 9 6 9 6 5 6 3 3 2 8 6 8 1 1 1 1 9 9
6 6 2 8 4 8 8 7 6 9 1 4 4 9 4 3 6 9 7 2
2 9 2 2 4 7 8 9 2 9 6 7 1 7 5 3 7 4 5 8
6 4 8 6 9 7 2 9 7 3 7 3 3 1 7 9 3 8 1 6
>> M(:) = bsxfun(@eq,M,max(M,[],2))
M =
0 0 1 0 0 0 0 0 0 0 0 0 0 1 0 0 1 0 0 0
1 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0
0 0 0 0 1 1 0 0 0 0 0 0 0 0 0 0 0 1 0 0
0 0 0 0 0 0 1 0 1 0 0 0 0 0 0 0 0 0 0 1
0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1
0 0 1 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1
0 0 0 0 0 0 0 0 0 1 0 0 0 1 0 0 0 1 0 0
0 1 0 0 0 0 0 1 0 1 0 0 0 0 0 0 0 0 0 0
0 0 0 0 1 0 0 1 0 0 0 0 0 0 0 1 0 0 0 0
This marks every instance of the maximum values in the row, If you only want to mark the first instance of the maximum value in the row, then this is also easy:
>> M(:) = M & cumsum(M,2)==1
M =
0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0
0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0
0 comentarios
La pregunta está cerrada.
Ver también
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!