Need to obtain two unknown coefficients

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Stelios Fanourakis
Stelios Fanourakis el 4 de Sept. de 2017
Comentada: Walter Roberson el 5 de Sept. de 2017
load('S_chest.mat');
load('S_abdomen.mat');
x= S_chest;
y= S_abdomen;
A=zeros(5955,2);
A(1,1)=x(1);
for n= 2:5953
A(n,1)= x(n);
A(n,2)= x(n-1);
end
B=zeros(5955,2);
B(1,1)=y(1);
for i=2:5953
B(i,1)=y(i);
end
w= A/B;
w(w==0)= [];
disp(w);
I need to obtain w1, w2. Matlab comes out of many results but I only need two. How am I going to get them?
  2 comentarios
Wonsang You
Wonsang You el 4 de Sept. de 2017
The question is unclear. What are w1 ans w2? Are they some variables?
dpb
dpb el 4 de Sept. de 2017
I'm guessing OP is trying to fit some model but isn't clear what model is wanted. Knowing the size and what are the contents of the two data files might help some but as you point out, a clear problem statement would be better still.

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Walter Roberson
Walter Roberson el 4 de Sept. de 2017
My guess is that you want
w = A\B(:,1);
  3 comentarios
Stelios Fanourakis
Stelios Fanourakis el 5 de Sept. de 2017
Results are different for w1,w2 whether A\B or B\A. Mathematically as we shift x to the opposite side of equation comes B\A
Walter Roberson
Walter Roberson el 5 de Sept. de 2017
Vec = @(M) M(:);
A = [ Vec(x(2:end)), Vec(x(1:end-1))];
Now, A*x = y .
Pretend for a moment that A is a square matrix (so inv(A) exists). Pre-multiply by inv(A), getting
inv(A)*A*x = inv(A)*y
inv(A)*A would be the identity matrix, so you would have
x = inv(A)*y
which is the operation A\y

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