Sigma notation - two variables. 'for' loop or symsum?
2 visualizaciones (últimos 30 días)
Mostrar comentarios más antiguos
Nate
el 20 de Oct. de 2014
Comentada: Roger Stafford
el 22 de Oct. de 2014
Hello
I am trying to compute a sigma summation of a simple single column vector x, where:
N = length(x)
k = 0:N/4
i = 1:N-k
I need to solve for Axx(k):
I have tried to solve this using 'for' loops and symsum function, without success. Help is hugely appreciated, thanks.
0 comentarios
Respuesta aceptada
Star Strider
el 20 de Oct. de 2014
This runs:
N = length(x);
for k = 0:N/4
Axx(k+1) = 0;
for i = 1:N-k
Axx(k+1) = Axx(k+1) + x(i)*x(i+k);
end
end
I’ll let you determine if it gives the answers you expect.
2 comentarios
Más respuestas (1)
Roger Stafford
el 21 de Oct. de 2014
Axx = x.'*hankel(x,zeros(1,N/4+1));
2 comentarios
Roger Stafford
el 22 de Oct. de 2014
That's probably because your value N is not a multiple of 4. Do this:
round(N/4)+1
instead.
Ver también
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!