Getting a diag function
9 Ansichten (letzte 30 Tage)
Ältere Kommentare anzeigen
Hi there im stuck with this problem and really would like help here
n=length(x) %Let says is 20
x=rand(n,1);
y=rand(n,1);
RHS_empty=ones(ny,1);
iter_h=0;
for i=1:n-1
h(i)=x(i+1)-x(i);
iter_h=iter_h+1;
Ma_Sp=diag(1 h(i)) 2(h(i+1)*h(i))
end
I like to create a diagonal matrix with the interval with the specific things,
The diagonal matrix size is depending on the h(i), meaning h19, i like to get the matrix to be 20x20 with 1 at the first lane and h1 2h2*h1 h2 2h3*h2 hn 2h(i+1)*h(i) for the second coloum and it goes on for the third coloum and the fourth all the way to the 20th column, i am stuck on this matter and would appreciate your help
3 Kommentare
Jan
am 18 Mär. 2021
Bearbeitet: Jan
am 18 Mär. 2021
The shown matrix A is not diagonal. Diagonal matrices contaoin non-zero elements on the diagonal only. You can create them with the command diag() .
There is a large, if not infitine number of ways, to fill a 20x20 matrix with a 4x4 matrix.
Maybe you are looking for the kron() command:
x = [1,2;3,4]
x =
1 2
3 4
kron(eye(3), x)
ans =
1 2 0 0 0 0
3 4 0 0 0 0
0 0 1 2 0 0
0 0 3 4 0 0
0 0 0 0 1 2
0 0 0 0 3 4
Antworten (0)
Siehe auch
Kategorien
Mehr zu Creating and Concatenating Matrices finden Sie in Help Center und File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!